diff --git a/commitizen/bump.py b/commitizen/bump.py
index 76a8e15893..ea54b60454 100644
--- a/commitizen/bump.py
+++ b/commitizen/bump.py
@@ -2,60 +2,13 @@
 
 import os
 import re
-from collections import OrderedDict
 from glob import iglob
-from logging import getLogger
 from string import Template
-from typing import cast
 
-from commitizen.defaults import BUMP_MESSAGE, ENCODING, MAJOR, MINOR, PATCH
+from commitizen.defaults import BUMP_MESSAGE, ENCODING
 from commitizen.exceptions import CurrentVersionNotFoundError
-from commitizen.git import GitCommit, smart_open
-from commitizen.version_schemes import Increment, Version
-
-VERSION_TYPES = [None, PATCH, MINOR, MAJOR]
-
-logger = getLogger("commitizen")
-
-
-def find_increment(
-    commits: list[GitCommit], regex: str, increments_map: dict | OrderedDict
-) -> Increment | None:
-    if isinstance(increments_map, dict):
-        increments_map = OrderedDict(increments_map)
-
-    # Most important cases are major and minor.
-    # Everything else will be considered patch.
-    select_pattern = re.compile(regex)
-    increment: str | None = None
-
-    for commit in commits:
-        for message in commit.message.split("\n"):
-            result = select_pattern.search(message)
-
-            if result:
-                found_keyword = result.group(1)
-                new_increment = None
-                for match_pattern in increments_map.keys():
-                    if re.match(match_pattern, found_keyword):
-                        new_increment = increments_map[match_pattern]
-                        break
-
-                if new_increment is None:
-                    logger.debug(
-                        f"no increment needed for '{found_keyword}' in '{message}'"
-                    )
-
-                if VERSION_TYPES.index(increment) < VERSION_TYPES.index(new_increment):
-                    logger.debug(
-                        f"increment detected is '{new_increment}' due to '{found_keyword}' in '{message}'"
-                    )
-                    increment = new_increment
-
-                if increment == MAJOR:
-                    break
-
-    return cast(Increment, increment)
+from commitizen.git import smart_open
+from commitizen.version_schemes import Version
 
 
 def update_version_in_files(
diff --git a/commitizen/bump_rule.py b/commitizen/bump_rule.py
new file mode 100644
index 0000000000..24ec77d6bc
--- /dev/null
+++ b/commitizen/bump_rule.py
@@ -0,0 +1,253 @@
+from __future__ import annotations
+
+import re
+from collections.abc import Iterable, Mapping
+from enum import IntEnum, auto
+from functools import cached_property
+from typing import Callable, Protocol
+
+from commitizen.exceptions import NoPatternMapError
+
+
+class SemVerIncrement(IntEnum):
+    """An enumeration representing semantic versioning increments.
+
+    This class defines the three types of version increments according to semantic versioning:
+    - PATCH: For backwards-compatible bug fixes
+    - MINOR: For backwards-compatible functionality additions
+    - MAJOR: For incompatible API changes
+    """
+
+    PATCH = auto()
+    MINOR = auto()
+    MAJOR = auto()
+
+    def __str__(self) -> str:
+        return self.name
+
+    @classmethod
+    def safe_cast(cls, value: object) -> SemVerIncrement | None:
+        if not isinstance(value, str):
+            return None
+        try:
+            return cls[value]
+        except KeyError:
+            return None
+
+    @classmethod
+    def safe_cast_dict(cls, d: Mapping[str, object]) -> dict[str, SemVerIncrement]:
+        return {
+            k: v
+            for k, v in ((k, SemVerIncrement.safe_cast(v)) for k, v in d.items())
+            if v is not None
+        }
+
+    @staticmethod
+    def get_highest_by_messages(
+        commit_messages: Iterable[str],
+        get_increment: Callable[[str], SemVerIncrement | None],
+    ) -> SemVerIncrement | None:
+        """Find the highest version increment from a list of messages.
+
+        This function processes a list of messages and determines the highest version
+        increment needed based on the commit messages. It splits multi-line commit messages
+        and evaluates each line using the provided get_increment callable.
+
+        Args:
+            commit_messages: A list of messages to analyze.
+            get_increment: A callable that takes a commit message string and returns an
+                SemVerIncrement value (MAJOR, MINOR, PATCH) or None if no increment is needed.
+
+        Returns:
+            The highest version increment needed (MAJOR, MINOR, PATCH) or None if no
+            increment is needed. The order of precedence is MAJOR > MINOR > PATCH.
+
+        Example:
+            >>> commit_messages = ["feat: new feature", "fix: bug fix"]
+            >>> rule = ConventionalCommitBumpRule()
+            >>> SemVerIncrement.get_highest_by_messages(commit_messages, lambda x: rule.get_increment(x, False))
+            'MINOR'
+        """
+        return SemVerIncrement.get_highest(
+            get_increment(line)
+            for message in commit_messages
+            for line in message.split("\n")
+        )
+
+    @staticmethod
+    def get_highest(
+        increments: Iterable[SemVerIncrement | None],
+    ) -> SemVerIncrement | None:
+        return max(filter(None, increments), default=None)
+
+
+class BumpRule(Protocol):
+    """A protocol defining the interface for version bump rules.
+
+    This protocol specifies the contract that all version bump rule implementations must follow.
+    It defines how commit messages should be analyzed to determine the appropriate semantic
+    version increment.
+
+    The protocol is used to ensure consistent behavior across different bump rule implementations,
+    such as conventional commits or custom rules.
+    """
+
+    def get_increment(
+        self, commit_message: str, major_version_zero: bool
+    ) -> SemVerIncrement | None:
+        """Determine the version increment based on a commit message.
+
+        This method analyzes a commit message to determine what kind of version increment
+        is needed according to the Conventional Commits specification. It handles special
+        cases for breaking changes and respects the major_version_zero flag.
+
+        Args:
+            commit_message: The commit message to analyze. Should follow conventional commit format.
+            major_version_zero: If True, breaking changes will result in a MINOR version bump
+                              instead of MAJOR. This is useful for projects in 0.x.x versions.
+
+        Returns:
+            SemVerIncrement | None: The type of version increment needed:
+                - MAJOR: For breaking changes when major_version_zero is False
+                - MINOR: For breaking changes when major_version_zero is True, or for new features
+                - PATCH: For bug fixes, performance improvements, or refactors
+                - None: For commits that don't require a version bump (docs, style, etc.)
+        """
+
+
+class ConventionalCommitBumpRule(BumpRule):
+    _BREAKING_CHANGE_TYPES = set(["BREAKING CHANGE", "BREAKING-CHANGE"])
+    _MINOR_CHANGE_TYPES = set(["feat"])
+    _PATCH_CHANGE_TYPES = set(["fix", "perf", "refactor"])
+
+    def get_increment(
+        self, commit_message: str, major_version_zero: bool
+    ) -> SemVerIncrement | None:
+        if not (m := self._head_pattern.match(commit_message)):
+            return None
+
+        change_type = m.group("change_type")
+        if m.group("bang") or change_type in self._BREAKING_CHANGE_TYPES:
+            return (
+                SemVerIncrement.MINOR if major_version_zero else SemVerIncrement.MAJOR
+            )
+
+        if change_type in self._MINOR_CHANGE_TYPES:
+            return SemVerIncrement.MINOR
+
+        if change_type in self._PATCH_CHANGE_TYPES:
+            return SemVerIncrement.PATCH
+
+        return None
+
+    @cached_property
+    def _head_pattern(self) -> re.Pattern:
+        change_types = [
+            *self._BREAKING_CHANGE_TYPES,
+            *self._PATCH_CHANGE_TYPES,
+            *self._MINOR_CHANGE_TYPES,
+            "docs",
+            "style",
+            "test",
+            "build",
+            "ci",
+        ]
+        re_change_type = r"(?P<change_type>" + "|".join(change_types) + r")"
+        re_scope = r"(?P<scope>\(.+\))?"
+        re_bang = r"(?P<bang>!)?"
+        return re.compile(f"^{re_change_type}{re_scope}{re_bang}:")
+
+
+class CustomBumpRule(BumpRule):
+    def __init__(
+        self,
+        bump_pattern: str,
+        bump_map: Mapping[str, SemVerIncrement],
+        bump_map_major_version_zero: Mapping[str, SemVerIncrement],
+    ):
+        """Initialize a custom bump rule for version incrementing.
+
+        This constructor creates a rule that determines how version numbers should be
+        incremented based on commit messages. It validates and compiles the provided
+        pattern and maps for use in version bumping.
+
+        The fallback logic is used for backward compatibility.
+
+        Args:
+            bump_pattern: A regex pattern string used to match commit messages.
+                Example: r"^((?P<major>major)|(?P<minor>minor)|(?P<patch>patch))(?P<scope>\(.+\))?(?P<bang>!)?:"
+                Or with fallback regex: r"^((BREAKING[\-\ ]CHANGE|\w+)(\(.+\))?!?):"  # First group is type
+            bump_map: A mapping of commit types to their corresponding version increments.
+                Example: {
+                    "major": SemVerIncrement.MAJOR,
+                    "bang": SemVerIncrement.MAJOR,
+                    "minor": SemVerIncrement.MINOR,
+                    "patch": SemVerIncrement.PATCH
+                }
+                Or with fallback: {
+                    (r"^.+!$", SemVerIncrement.MAJOR),
+                    (r"^BREAKING[\-\ ]CHANGE", SemVerIncrement.MAJOR),
+                    (r"^feat", SemVerIncrement.MINOR),
+                    (r"^fix", SemVerIncrement.PATCH),
+                    (r"^refactor", SemVerIncrement.PATCH),
+                    (r"^perf", SemVerIncrement.PATCH),
+                }
+            bump_map_major_version_zero: A mapping of commit types to version increments
+                specifically for when the major version is 0. This allows for different
+                versioning behavior during initial development.
+                The format is the same as bump_map.
+                Example: {
+                    "major": SemVerIncrement.MINOR,  # MAJOR becomes MINOR in version zero
+                    "bang": SemVerIncrement.MINOR,   # Breaking changes become MINOR in version zero
+                    "minor": SemVerIncrement.MINOR,
+                    "patch": SemVerIncrement.PATCH
+                }
+                Or with fallback: {
+                    (r"^.+!$", SemVerIncrement.MINOR),
+                    (r"^BREAKING[\-\ ]CHANGE", SemVerIncrement.MINOR),
+                    (r"^feat", SemVerIncrement.MINOR),
+                    (r"^fix", SemVerIncrement.PATCH),
+                    (r"^refactor", SemVerIncrement.PATCH),
+                    (r"^perf", SemVerIncrement.PATCH),
+                }
+
+        Raises:
+            NoPatternMapError: If any of the required parameters are empty or None
+        """
+        if not bump_map or not bump_pattern or not bump_map_major_version_zero:
+            raise NoPatternMapError(
+                f"Invalid bump rule: {bump_pattern=} and {bump_map=} and {bump_map_major_version_zero=}"
+            )
+
+        self.bump_pattern = re.compile(bump_pattern)
+        self.bump_map = bump_map
+        self.bump_map_major_version_zero = bump_map_major_version_zero
+
+    def get_increment(
+        self, commit_message: str, major_version_zero: bool
+    ) -> SemVerIncrement | None:
+        if not (m := self.bump_pattern.search(commit_message)):
+            return None
+
+        effective_bump_map = (
+            self.bump_map_major_version_zero if major_version_zero else self.bump_map
+        )
+
+        try:
+            if ret := SemVerIncrement.get_highest(
+                (
+                    increment
+                    for name, increment in effective_bump_map.items()
+                    if m.group(name)
+                ),
+            ):
+                return ret
+        except IndexError:
+            pass
+
+        # Fallback to old school bump rule, for backward compatibility
+        found_keyword = m.group(1)
+        for match_pattern, increment in effective_bump_map.items():
+            if re.match(match_pattern, found_keyword):
+                return increment
+        return None
diff --git a/commitizen/commands/bump.py b/commitizen/commands/bump.py
index 0a2bbe37fc..da0bb24cca 100644
--- a/commitizen/commands/bump.py
+++ b/commitizen/commands/bump.py
@@ -7,6 +7,9 @@
 import questionary
 
 from commitizen import bump, factory, git, hooks, out
+from commitizen.bump_rule import (
+    SemVerIncrement,
+)
 from commitizen.changelog_formats import get_changelog_format
 from commitizen.commands.changelog import Changelog
 from commitizen.config import BaseConfig
@@ -20,7 +23,6 @@
     InvalidManualVersion,
     NoCommitsFoundError,
     NoneIncrementExit,
-    NoPatternMapError,
     NotAGitProjectError,
     NotAllowed,
     NoVersionSpecifiedError,
@@ -28,7 +30,6 @@
 from commitizen.providers import get_provider
 from commitizen.tags import TagRules
 from commitizen.version_schemes import (
-    Increment,
     InvalidVersion,
     Prerelease,
     get_version_scheme,
@@ -119,25 +120,14 @@ def is_initial_tag(
                 is_initial = questionary.confirm("Is this the first tag created?").ask()
         return is_initial
 
-    def find_increment(self, commits: list[git.GitCommit]) -> Increment | None:
+    def find_increment(self, commits: list[git.GitCommit]) -> SemVerIncrement | None:
         # Update the bump map to ensure major version doesn't increment.
-        is_major_version_zero: bool = self.bump_settings["major_version_zero"]
-        # self.cz.bump_map = defaults.bump_map_major_version_zero
-        bump_map = (
-            self.cz.bump_map_major_version_zero
-            if is_major_version_zero
-            else self.cz.bump_map
-        )
-        bump_pattern = self.cz.bump_pattern
+        is_major_version_zero = bool(self.bump_settings["major_version_zero"])
 
-        if not bump_map or not bump_pattern:
-            raise NoPatternMapError(
-                f"'{self.config.settings['name']}' rule does not support bump"
-            )
-        increment = bump.find_increment(
-            commits, regex=bump_pattern, increments_map=bump_map
+        return SemVerIncrement.get_highest_by_messages(
+            (commit.message for commit in commits),
+            lambda x: self.cz.bump_rule.get_increment(x, is_major_version_zero),
         )
-        return increment
 
     def __call__(self) -> None:  # noqa: C901
         """Steps executed to bump."""
@@ -155,8 +145,8 @@ def __call__(self) -> None:  # noqa: C901
 
         dry_run: bool = self.arguments["dry_run"]
         is_yes: bool = self.arguments["yes"]
-        increment: Increment | None = self.arguments["increment"]
-        prerelease: Prerelease | None = self.arguments["prerelease"]
+        increment = SemVerIncrement.safe_cast(self.arguments["increment"])
+        prerelease = Prerelease.safe_cast(self.arguments["prerelease"])
         devrelease: int | None = self.arguments["devrelease"]
         is_files_only: bool | None = self.arguments["files_only"]
         is_local_version: bool = self.arguments["local_version"]
@@ -272,7 +262,7 @@ def __call__(self) -> None:  # noqa: C901
 
             # we create an empty PATCH increment for empty tag
             if increment is None and allow_no_commit:
-                increment = "PATCH"
+                increment = SemVerIncrement.PATCH
 
             new_version = current_version.bump(
                 increment,
diff --git a/commitizen/cz/base.py b/commitizen/cz/base.py
index 43455a74ca..cf9c20ea04 100644
--- a/commitizen/cz/base.py
+++ b/commitizen/cz/base.py
@@ -2,14 +2,17 @@
 
 from abc import ABCMeta, abstractmethod
 from collections.abc import Iterable
+from functools import cached_property
 from typing import Any, Callable, Protocol
 
 from jinja2 import BaseLoader, PackageLoader
 from prompt_toolkit.styles import Style, merge_styles
 
 from commitizen import git
+from commitizen.bump_rule import BumpRule, CustomBumpRule, SemVerIncrement
 from commitizen.config.base_config import BaseConfig
 from commitizen.defaults import Questions
+from commitizen.exceptions import NoPatternMapError
 
 
 class MessageBuilderHook(Protocol):
@@ -25,9 +28,13 @@ def __call__(
 
 
 class BaseCommitizen(metaclass=ABCMeta):
+    _bump_rule: BumpRule | None = None
+
+    # TODO: decide if these should be removed
     bump_pattern: str | None = None
     bump_map: dict[str, str] | None = None
     bump_map_major_version_zero: dict[str, str] | None = None
+
     default_style_config: list[tuple[str, str]] = [
         ("qmark", "fg:#ff9d00 bold"),
         ("question", "bold"),
@@ -84,6 +91,44 @@ def style(self):
             ]
         )
 
+    @cached_property
+    def bump_rule(self) -> BumpRule:
+        """Get the bump rule for version incrementing.
+
+        This property returns a BumpRule instance that determines how version numbers
+        should be incremented based on commit messages. It first checks if a custom
+        bump rule was set via `_bump_rule`. If not, it falls back to creating a
+        CustomBumpRule using the class's bump pattern and maps.
+
+        The CustomBumpRule requires three components to be defined:
+        - bump_pattern: A regex pattern to match commit messages
+        - bump_map: A mapping of commit types to version increments
+        - bump_map_major_version_zero: A mapping for version increments when major version is 0
+
+        Returns:
+            BumpRule: A rule instance that determines version increments
+
+        Raises:
+            NoPatternMapError: If the required bump pattern or maps are not defined
+        """
+        if self._bump_rule:
+            return self._bump_rule
+
+        # Fallback to custom bump rule if no bump rule is provided
+        if (
+            not self.bump_pattern
+            or not self.bump_map
+            or not self.bump_map_major_version_zero
+        ):
+            raise NoPatternMapError(
+                f"'{self.config.settings['name']}' rule does not support bump: {self.bump_pattern=}, {self.bump_map=}, {self.bump_map_major_version_zero=}"
+            )
+        return CustomBumpRule(
+            self.bump_pattern,
+            SemVerIncrement.safe_cast_dict(self.bump_map),
+            SemVerIncrement.safe_cast_dict(self.bump_map_major_version_zero),
+        )
+
     def example(self) -> str:
         """Example of the commit message."""
         raise NotImplementedError("Not Implemented yet")
diff --git a/commitizen/cz/conventional_commits/conventional_commits.py b/commitizen/cz/conventional_commits/conventional_commits.py
index af29a209fc..1738fab07f 100644
--- a/commitizen/cz/conventional_commits/conventional_commits.py
+++ b/commitizen/cz/conventional_commits/conventional_commits.py
@@ -2,6 +2,7 @@
 import re
 
 from commitizen import defaults
+from commitizen.bump_rule import ConventionalCommitBumpRule
 from commitizen.cz.base import BaseCommitizen
 from commitizen.cz.utils import multiple_line_breaker, required_validator
 from commitizen.defaults import Questions
@@ -28,6 +29,8 @@ def parse_subject(text):
 
 
 class ConventionalCommitsCz(BaseCommitizen):
+    _bump_rule = ConventionalCommitBumpRule()
+
     bump_pattern = defaults.BUMP_PATTERN
     bump_map = defaults.BUMP_MAP
     bump_map_major_version_zero = defaults.BUMP_MAP_MAJOR_VERSION_ZERO
diff --git a/commitizen/defaults.py b/commitizen/defaults.py
index 0b6c28e6a9..fd188878c6 100644
--- a/commitizen/defaults.py
+++ b/commitizen/defaults.py
@@ -5,6 +5,8 @@
 from collections.abc import Iterable, MutableMapping, Sequence
 from typing import Any, TypedDict
 
+from commitizen.bump_rule import SemVerIncrement
+
 # Type
 Questions = Iterable[MutableMapping[str, Any]]
 
@@ -107,31 +109,27 @@ class Settings(TypedDict, total=False):
     "extras": {},
 }
 
-MAJOR = "MAJOR"
-MINOR = "MINOR"
-PATCH = "PATCH"
-
 CHANGELOG_FORMAT = "markdown"
 
 BUMP_PATTERN = r"^((BREAKING[\-\ ]CHANGE|\w+)(\(.+\))?!?):"
 BUMP_MAP = OrderedDict(
     (
-        (r"^.+!$", MAJOR),
-        (r"^BREAKING[\-\ ]CHANGE", MAJOR),
-        (r"^feat", MINOR),
-        (r"^fix", PATCH),
-        (r"^refactor", PATCH),
-        (r"^perf", PATCH),
+        (r"^.+!$", str(SemVerIncrement.MAJOR)),
+        (r"^BREAKING[\-\ ]CHANGE", str(SemVerIncrement.MAJOR)),
+        (r"^feat", str(SemVerIncrement.MINOR)),
+        (r"^fix", str(SemVerIncrement.PATCH)),
+        (r"^refactor", str(SemVerIncrement.PATCH)),
+        (r"^perf", str(SemVerIncrement.PATCH)),
     )
 )
 BUMP_MAP_MAJOR_VERSION_ZERO = OrderedDict(
     (
-        (r"^.+!$", MINOR),
-        (r"^BREAKING[\-\ ]CHANGE", MINOR),
-        (r"^feat", MINOR),
-        (r"^fix", PATCH),
-        (r"^refactor", PATCH),
-        (r"^perf", PATCH),
+        (r"^.+!$", str(SemVerIncrement.MINOR)),
+        (r"^BREAKING[\-\ ]CHANGE", str(SemVerIncrement.MINOR)),
+        (r"^feat", str(SemVerIncrement.MINOR)),
+        (r"^fix", str(SemVerIncrement.PATCH)),
+        (r"^refactor", str(SemVerIncrement.PATCH)),
+        (r"^perf", str(SemVerIncrement.PATCH)),
     )
 )
 CHANGE_TYPE_ORDER = ["BREAKING CHANGE", "Feat", "Fix", "Refactor", "Perf"]
diff --git a/commitizen/version_schemes.py b/commitizen/version_schemes.py
index 84ded9316e..40ac9929a3 100644
--- a/commitizen/version_schemes.py
+++ b/commitizen/version_schemes.py
@@ -3,17 +3,19 @@
 import re
 import sys
 import warnings
+from enum import Enum
 from itertools import zip_longest
 from typing import (
     TYPE_CHECKING,
     Any,
     ClassVar,
-    Literal,
     Protocol,
     cast,
     runtime_checkable,
 )
 
+from commitizen.bump_rule import SemVerIncrement
+
 if sys.version_info >= (3, 10):
     from importlib import metadata
 else:
@@ -22,7 +24,7 @@
 from packaging.version import InvalidVersion  # noqa: F401: expose the common exception
 from packaging.version import Version as _BaseVersion
 
-from commitizen.defaults import MAJOR, MINOR, PATCH, Settings
+from commitizen.defaults import Settings
 from commitizen.exceptions import VersionSchemeUnknown
 
 if TYPE_CHECKING:
@@ -39,8 +41,21 @@
         from typing import Self
 
 
-Increment: TypeAlias = Literal["MAJOR", "MINOR", "PATCH"]
-Prerelease: TypeAlias = Literal["alpha", "beta", "rc"]
+class Prerelease(Enum):
+    ALPHA = "alpha"
+    BETA = "beta"
+    RC = "rc"
+
+    @classmethod
+    def safe_cast(cls, value: object) -> Prerelease | None:
+        if not isinstance(value, str):
+            return None
+        try:
+            return cls[value.upper()]
+        except KeyError:
+            return None
+
+
 DEFAULT_VERSION_PARSER = r"v?(?P<version>([0-9]+)\.([0-9]+)(?:\.([0-9]+))?(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z.]+)?(\w+)?)"
 
 
@@ -126,7 +141,7 @@ def __ne__(self, other: object) -> bool:
 
     def bump(
         self,
-        increment: Increment | None,
+        increment: SemVerIncrement | None,
         prerelease: Prerelease | None = None,
         prerelease_offset: int = 0,
         devrelease: int | None = None,
@@ -171,7 +186,7 @@ def prerelease(self) -> str | None:
         return None
 
     def generate_prerelease(
-        self, prerelease: str | None = None, offset: int = 0
+        self, prerelease: Prerelease | None = None, offset: int = 0
     ) -> str:
         """Generate prerelease
 
@@ -186,20 +201,18 @@ def generate_prerelease(
         if not prerelease:
             return ""
 
+        prerelease_value = prerelease.value
+        new_prerelease_number = offset
+
         # prevent down-bumping the pre-release phase, e.g. from 'b1' to 'a2'
         # https://packaging.python.org/en/latest/specifications/version-specifiers/#pre-releases
         # https://semver.org/#spec-item-11
         if self.is_prerelease and self.pre:
-            prerelease = max(prerelease, self.pre[0])
+            prerelease_value = max(prerelease_value, self.pre[0])
+            if prerelease_value.startswith(self.pre[0]):
+                new_prerelease_number = self.pre[1] + 1
 
-        # version.pre is needed for mypy check
-        if self.is_prerelease and self.pre and prerelease.startswith(self.pre[0]):
-            prev_prerelease: int = self.pre[1]
-            new_prerelease_number = prev_prerelease + 1
-        else:
-            new_prerelease_number = offset
-        pre_version = f"{prerelease}{new_prerelease_number}"
-        return pre_version
+        return f"{prerelease_value}{new_prerelease_number}"
 
     def generate_devrelease(self, devrelease: int | None) -> str:
         """Generate devrelease
@@ -223,26 +236,30 @@ def generate_build_metadata(self, build_metadata: str | None) -> str:
 
         return f"+{build_metadata}"
 
-    def increment_base(self, increment: Increment | None = None) -> str:
-        prev_release = list(self.release)
-        increments = [MAJOR, MINOR, PATCH]
-        base = dict(zip_longest(increments, prev_release, fillvalue=0))
+    def increment_base(self, increment: SemVerIncrement | None = None) -> str:
+        base = dict(
+            zip_longest(
+                (SemVerIncrement.MAJOR, SemVerIncrement.MINOR, SemVerIncrement.PATCH),
+                self.release,
+                fillvalue=0,
+            )
+        )
 
-        if increment == MAJOR:
-            base[MAJOR] += 1
-            base[MINOR] = 0
-            base[PATCH] = 0
-        elif increment == MINOR:
-            base[MINOR] += 1
-            base[PATCH] = 0
-        elif increment == PATCH:
-            base[PATCH] += 1
+        if increment == SemVerIncrement.MAJOR:
+            base[SemVerIncrement.MAJOR] += 1
+            base[SemVerIncrement.MINOR] = 0
+            base[SemVerIncrement.PATCH] = 0
+        elif increment == SemVerIncrement.MINOR:
+            base[SemVerIncrement.MINOR] += 1
+            base[SemVerIncrement.PATCH] = 0
+        elif increment == SemVerIncrement.PATCH:
+            base[SemVerIncrement.PATCH] += 1
 
-        return f"{base[MAJOR]}.{base[MINOR]}.{base[PATCH]}"
+        return f"{base[SemVerIncrement.MAJOR]}.{base[SemVerIncrement.MINOR]}.{base[SemVerIncrement.PATCH]}"
 
     def bump(
         self,
-        increment: Increment | None,
+        increment: SemVerIncrement | None,
         prerelease: Prerelease | None = None,
         prerelease_offset: int = 0,
         devrelease: int | None = None,
@@ -272,12 +289,12 @@ def bump(
                 base = self.increment_base(increment)
             else:
                 base = f"{self.major}.{self.minor}.{self.micro}"
-                if increment == PATCH:
+                if increment == SemVerIncrement.PATCH:
                     pass
-                elif increment == MINOR:
+                elif increment == SemVerIncrement.MINOR:
                     if self.micro != 0:
                         base = self.increment_base(increment)
-                elif increment == MAJOR:
+                elif increment == SemVerIncrement.MAJOR:
                     if self.minor != 0 or self.micro != 0:
                         base = self.increment_base(increment)
             dev_version = self.generate_devrelease(devrelease)
diff --git a/tests/commands/test_bump_command.py b/tests/commands/test_bump_command.py
index e15539d8a7..7b3203a981 100644
--- a/tests/commands/test_bump_command.py
+++ b/tests/commands/test_bump_command.py
@@ -13,6 +13,7 @@
 
 import commitizen.commands.bump as bump
 from commitizen import cli, cmd, git, hooks
+from commitizen.bump_rule import SemVerIncrement
 from commitizen.changelog_formats import ChangelogFormat
 from commitizen.cz.base import BaseCommitizen
 from commitizen.exceptions import (
@@ -1000,7 +1001,7 @@ def test_bump_with_pre_bump_hooks(
                 new_version="0.2.0",
                 new_tag_version="0.2.0",
                 message="bump: version 0.1.0 → 0.2.0",
-                increment="MINOR",
+                increment=SemVerIncrement.MINOR,
                 changelog_file_name=None,
             ),
             call(
@@ -1012,7 +1013,7 @@ def test_bump_with_pre_bump_hooks(
                 current_version="0.2.0",
                 current_tag_version="0.2.0",
                 message="bump: version 0.1.0 → 0.2.0",
-                increment="MINOR",
+                increment=SemVerIncrement.MINOR,
                 changelog_file_name=None,
             ),
         ]
diff --git a/tests/test_bump_find_increment.py b/tests/test_bump_find_increment.py
deleted file mode 100644
index ff24ff17a7..0000000000
--- a/tests/test_bump_find_increment.py
+++ /dev/null
@@ -1,124 +0,0 @@
-"""
-CC: Conventional commits
-SVE: Semantic version at the end
-"""
-
-import pytest
-
-from commitizen import bump
-from commitizen.cz.conventional_commits import ConventionalCommitsCz
-from commitizen.git import GitCommit
-
-NONE_INCREMENT_CC = [
-    "docs(README): motivation",
-    "ci: added travis",
-    "performance. Remove or disable the reimplemented linters",
-    "refactor that how this line starts",
-]
-
-PATCH_INCREMENTS_CC = [
-    "fix(setup.py): future is now required for every python version",
-    "docs(README): motivation",
-]
-
-MINOR_INCREMENTS_CC = [
-    "feat(cli): added version",
-    "docs(README): motivation",
-    "fix(setup.py): future is now required for every python version",
-    "perf: app is much faster",
-    "refactor: app is much faster",
-]
-
-MAJOR_INCREMENTS_BREAKING_CHANGE_CC = [
-    "feat(cli): added version",
-    "docs(README): motivation",
-    "BREAKING CHANGE: `extends` key in config file is now used for extending other config files",  # noqa
-    "fix(setup.py): future is now required for every python version",
-]
-
-MAJOR_INCREMENTS_BREAKING_CHANGE_ALT_CC = [
-    "feat(cli): added version",
-    "docs(README): motivation",
-    "BREAKING-CHANGE: `extends` key in config file is now used for extending other config files",  # noqa
-    "fix(setup.py): future is now required for every python version",
-]
-
-MAJOR_INCREMENTS_EXCLAMATION_CC = [
-    "feat(cli)!: added version",
-    "docs(README): motivation",
-    "fix(setup.py): future is now required for every python version",
-]
-
-MAJOR_INCREMENTS_EXCLAMATION_CC_SAMPLE_2 = [
-    "feat(pipeline)!: some text with breaking change"
-]
-
-MAJOR_INCREMENTS_EXCLAMATION_OTHER_TYPE_CC = [
-    "chore!: drop support for Python 3.9",
-    "docs(README): motivation",
-    "fix(setup.py): future is now required for every python version",
-]
-
-MAJOR_INCREMENTS_EXCLAMATION_OTHER_TYPE_WITH_SCOPE_CC = [
-    "chore(deps)!: drop support for Python 3.9",
-    "docs(README): motivation",
-    "fix(setup.py): future is now required for every python version",
-]
-
-PATCH_INCREMENTS_SVE = ["readme motivation PATCH", "fix setup.py PATCH"]
-
-MINOR_INCREMENTS_SVE = [
-    "readme motivation PATCH",
-    "fix setup.py PATCH",
-    "added version to cli MINOR",
-]
-
-MAJOR_INCREMENTS_SVE = [
-    "readme motivation PATCH",
-    "fix setup.py PATCH",
-    "added version to cli MINOR",
-    "extends key is used for other config files MAJOR",
-]
-
-semantic_version_pattern = r"(MAJOR|MINOR|PATCH)"
-semantic_version_map = {"MAJOR": "MAJOR", "MINOR": "MINOR", "PATCH": "PATCH"}
-
-
-@pytest.mark.parametrize(
-    "messages, expected_type",
-    (
-        (PATCH_INCREMENTS_CC, "PATCH"),
-        (MINOR_INCREMENTS_CC, "MINOR"),
-        (MAJOR_INCREMENTS_BREAKING_CHANGE_CC, "MAJOR"),
-        (MAJOR_INCREMENTS_BREAKING_CHANGE_ALT_CC, "MAJOR"),
-        (MAJOR_INCREMENTS_EXCLAMATION_OTHER_TYPE_CC, "MAJOR"),
-        (MAJOR_INCREMENTS_EXCLAMATION_OTHER_TYPE_WITH_SCOPE_CC, "MAJOR"),
-        (MAJOR_INCREMENTS_EXCLAMATION_CC, "MAJOR"),
-        (MAJOR_INCREMENTS_EXCLAMATION_CC_SAMPLE_2, "MAJOR"),
-        (NONE_INCREMENT_CC, None),
-    ),
-)
-def test_find_increment(messages, expected_type):
-    commits = [GitCommit(rev="test", title=message) for message in messages]
-    increment_type = bump.find_increment(
-        commits,
-        regex=ConventionalCommitsCz.bump_pattern,
-        increments_map=ConventionalCommitsCz.bump_map,
-    )
-    assert increment_type == expected_type
-
-
-@pytest.mark.parametrize(
-    "messages, expected_type",
-    (
-        (PATCH_INCREMENTS_SVE, "PATCH"),
-        (MINOR_INCREMENTS_SVE, "MINOR"),
-        (MAJOR_INCREMENTS_SVE, "MAJOR"),
-    ),
-)
-def test_find_increment_sve(messages, expected_type):
-    commits = [GitCommit(rev="test", title=message) for message in messages]
-    increment_type = bump.find_increment(
-        commits, regex=semantic_version_pattern, increments_map=semantic_version_map
-    )
-    assert increment_type == expected_type
diff --git a/tests/test_bump_rule.py b/tests/test_bump_rule.py
new file mode 100644
index 0000000000..e67c5da7c3
--- /dev/null
+++ b/tests/test_bump_rule.py
@@ -0,0 +1,648 @@
+import pytest
+
+from commitizen.bump_rule import (
+    ConventionalCommitBumpRule,
+    CustomBumpRule,
+    SemVerIncrement,
+)
+from commitizen.defaults import (
+    BUMP_MAP,
+    BUMP_MAP_MAJOR_VERSION_ZERO,
+    BUMP_PATTERN,
+)
+from commitizen.exceptions import NoPatternMapError
+
+
+@pytest.fixture
+def bump_rule():
+    return ConventionalCommitBumpRule()
+
+
+class TestConventionalCommitBumpRule:
+    def test_feat_commit(self, bump_rule):
+        assert (
+            bump_rule.get_increment("feat: add new feature", False)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            bump_rule.get_increment("feat: add new feature", True)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_fix_commit(self, bump_rule):
+        assert bump_rule.get_increment("fix: fix bug", False) == SemVerIncrement.PATCH
+        assert bump_rule.get_increment("fix: fix bug", True) == SemVerIncrement.PATCH
+
+    def test_perf_commit(self, bump_rule):
+        assert (
+            bump_rule.get_increment("perf: improve performance", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            bump_rule.get_increment("perf: improve performance", True)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_refactor_commit(self, bump_rule):
+        assert (
+            bump_rule.get_increment("refactor: restructure code", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            bump_rule.get_increment("refactor: restructure code", True)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_breaking_change_with_bang(self, bump_rule):
+        assert (
+            bump_rule.get_increment("feat!: breaking change", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            bump_rule.get_increment("feat!: breaking change", True)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_breaking_change_type(self, bump_rule):
+        assert (
+            bump_rule.get_increment("BREAKING CHANGE: major change", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            bump_rule.get_increment("BREAKING CHANGE: major change", True)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_commit_with_scope(self, bump_rule):
+        assert (
+            bump_rule.get_increment("feat(api): add new endpoint", False)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            bump_rule.get_increment("fix(ui): fix button alignment", False)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_commit_with_complex_scopes(self, bump_rule):
+        # Test with multiple word scopes
+        assert (
+            bump_rule.get_increment("feat(user_management): add user roles", False)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            bump_rule.get_increment("fix(database_connection): handle timeout", False)
+            == SemVerIncrement.PATCH
+        )
+
+        # Test with nested scopes
+        assert (
+            bump_rule.get_increment("feat(api/auth): implement OAuth", False)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            bump_rule.get_increment("fix(ui/components): fix dropdown", False)
+            == SemVerIncrement.PATCH
+        )
+
+        # Test with breaking changes and scopes
+        assert (
+            bump_rule.get_increment("feat(api)!: remove deprecated endpoints", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            bump_rule.get_increment("feat(api)!: remove deprecated endpoints", True)
+            == SemVerIncrement.MINOR
+        )
+
+        # Test with BREAKING CHANGE and scopes
+        assert (
+            bump_rule.get_increment(
+                "BREAKING CHANGE(api): remove deprecated endpoints", False
+            )
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            bump_rule.get_increment(
+                "BREAKING CHANGE(api): remove deprecated endpoints", True
+            )
+            == SemVerIncrement.MINOR
+        )
+
+    def test_invalid_commit_message(self, bump_rule):
+        assert bump_rule.get_increment("invalid commit message", False) is None
+        assert bump_rule.get_increment("", False) is None
+        assert bump_rule.get_increment("feat", False) is None
+
+    def test_other_commit_types(self, bump_rule):
+        # These commit types should not trigger any version bump
+        assert bump_rule.get_increment("docs: update documentation", False) is None
+        assert bump_rule.get_increment("style: format code", False) is None
+        assert bump_rule.get_increment("test: add unit tests", False) is None
+        assert bump_rule.get_increment("build: update build config", False) is None
+        assert bump_rule.get_increment("ci: update CI pipeline", False) is None
+
+    def test_breaking_change_with_refactor(self, bump_rule):
+        """Test breaking changes with refactor type commit messages."""
+        # Breaking change with refactor type
+        assert (
+            bump_rule.get_increment("refactor!: drop support for Python 2.7", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            bump_rule.get_increment("refactor!: drop support for Python 2.7", True)
+            == SemVerIncrement.MINOR
+        )
+
+        # Breaking change with refactor type and scope
+        assert (
+            bump_rule.get_increment(
+                "refactor(api)!: remove deprecated endpoints", False
+            )
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            bump_rule.get_increment("refactor(api)!: remove deprecated endpoints", True)
+            == SemVerIncrement.MINOR
+        )
+
+        # Regular refactor (should be SemVerIncrement.PATCH)
+        assert (
+            bump_rule.get_increment("refactor: improve code structure", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            bump_rule.get_increment("refactor: improve code structure", True)
+            == SemVerIncrement.PATCH
+        )
+
+
+class TestFindIncrementByCallable:
+    @pytest.fixture
+    def get_increment(self, bump_rule):
+        return lambda x: bump_rule.get_increment(x, False)
+
+    def test_single_commit(self, get_increment):
+        commit_messages = ["feat: add new feature"]
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_multiple_commits(self, get_increment):
+        commit_messages = [
+            "feat: new feature",
+            "fix: bug fix",
+            "docs: update readme",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_breaking_change(self, get_increment):
+        commit_messages = [
+            "feat: new feature",
+            "feat!: breaking change",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            == SemVerIncrement.MAJOR
+        )
+
+    def test_multi_line_commit(self, get_increment):
+        commit_messages = [
+            "feat: new feature\n\nBREAKING CHANGE: major change",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            == SemVerIncrement.MAJOR
+        )
+
+    def test_no_increment_needed(self, get_increment):
+        commit_messages = [
+            "docs: update documentation",
+            "style: format code",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            is None
+        )
+
+    def test_empty_commits(self, get_increment):
+        commit_messages = []
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            is None
+        )
+
+    def test_major_version_zero(self):
+        bump_rule = ConventionalCommitBumpRule()
+
+        commit_messages = [
+            "feat!: breaking change",
+            "BREAKING CHANGE: major change",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(
+                commit_messages, lambda x: bump_rule.get_increment(x, True)
+            )
+            == SemVerIncrement.MINOR
+        )
+
+    def test_mixed_commit_types(self, get_increment):
+        commit_messages = [
+            "feat: new feature",
+            "fix: bug fix",
+            "perf: improve performance",
+            "refactor: restructure code",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_commit_with_scope(self, get_increment):
+        commit_messages = [
+            "feat(api): add new endpoint",
+            "fix(ui): fix button alignment",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(commit_messages, get_increment)
+            == SemVerIncrement.MINOR
+        )
+
+
+class TestCustomBumpRule:
+    @pytest.fixture
+    def bump_pattern(self):
+        return r"^.*?\[(.*?)\].*$"
+
+    @pytest.fixture
+    def bump_map(self):
+        return {
+            "MAJOR": SemVerIncrement.MAJOR,
+            "MINOR": SemVerIncrement.MINOR,
+            "PATCH": SemVerIncrement.PATCH,
+        }
+
+    @pytest.fixture
+    def bump_map_major_version_zero(self):
+        return {
+            "MAJOR": SemVerIncrement.MINOR,  # SemVerIncrement.MAJOR becomes SemVerIncrement.MINOR in version zero
+            "MINOR": SemVerIncrement.MINOR,
+            "PATCH": SemVerIncrement.PATCH,
+        }
+
+    @pytest.fixture
+    def custom_bump_rule(self, bump_pattern, bump_map, bump_map_major_version_zero):
+        return CustomBumpRule(bump_pattern, bump_map, bump_map_major_version_zero)
+
+    def test_major_version(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("feat: add new feature [MAJOR]", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            custom_bump_rule.get_increment("fix: bug fix [MAJOR]", False)
+            == SemVerIncrement.MAJOR
+        )
+
+    def test_minor_version(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("feat: add new feature [MINOR]", False)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            custom_bump_rule.get_increment("fix: bug fix [MINOR]", False)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_patch_version(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("feat: add new feature [PATCH]", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            custom_bump_rule.get_increment("fix: bug fix [PATCH]", False)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_major_version_zero(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("feat: add new feature [MAJOR]", True)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            custom_bump_rule.get_increment("fix: bug fix [MAJOR]", True)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_no_match(self, custom_bump_rule):
+        assert custom_bump_rule.get_increment("feat: add new feature", False) is None
+        assert custom_bump_rule.get_increment("fix: bug fix", False) is None
+
+    def test_invalid_pattern(self, bump_map, bump_map_major_version_zero):
+        with pytest.raises(NoPatternMapError):
+            CustomBumpRule("", bump_map, bump_map_major_version_zero)
+
+    def test_invalid_bump_map(self, bump_pattern):
+        with pytest.raises(NoPatternMapError):
+            CustomBumpRule(bump_pattern, {}, {})
+
+    def test_invalid_bump_map_major_version_zero(self, bump_pattern, bump_map):
+        with pytest.raises(NoPatternMapError):
+            CustomBumpRule(bump_pattern, bump_map, {})
+
+    def test_all_invalid(self):
+        with pytest.raises(NoPatternMapError):
+            CustomBumpRule("", {}, {})
+
+    def test_none_values(self):
+        with pytest.raises(NoPatternMapError):
+            CustomBumpRule(None, {}, {})
+
+    def test_empty_pattern_with_valid_maps(self, bump_map, bump_map_major_version_zero):
+        with pytest.raises(NoPatternMapError):
+            CustomBumpRule("", bump_map, bump_map_major_version_zero)
+
+    def test_empty_maps_with_valid_pattern(self, bump_pattern):
+        with pytest.raises(NoPatternMapError):
+            CustomBumpRule(bump_pattern, {}, {})
+
+    def test_complex_pattern(self):
+        pattern = r"^.*?\[(.*?)\].*?\[(.*?)\].*$"
+        bump_map = {
+            "MAJOR": SemVerIncrement.MAJOR,
+            "MINOR": SemVerIncrement.MINOR,
+            "PATCH": SemVerIncrement.PATCH,
+        }
+        rule = CustomBumpRule(pattern, bump_map, bump_map)
+
+        assert (
+            rule.get_increment(
+                "feat: add new feature [MAJOR] [MINOR]",
+                False,
+            )
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            rule.get_increment("fix: bug fix [MINOR] [PATCH]", False)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_with_find_increment_by_callable(self, custom_bump_rule):
+        commit_messages = [
+            "feat: add new feature [MAJOR]",
+            "fix: bug fix [PATCH]",
+            "docs: update readme [MINOR]",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(
+                commit_messages, lambda x: custom_bump_rule.get_increment(x, False)
+            )
+            == SemVerIncrement.MAJOR
+        )
+
+    def test_flexible_bump_map(self, custom_bump_rule):
+        """Test that _find_highest_increment is used correctly in bump map processing."""
+        # Test with multiple matching patterns
+        pattern = r"^((?P<major>major)|(?P<minor>minor)|(?P<patch>patch))(?P<scope>\(.+\))?(?P<bang>!)?:"
+        bump_map = {
+            "major": SemVerIncrement.MAJOR,
+            "bang": SemVerIncrement.MAJOR,
+            "minor": SemVerIncrement.MINOR,
+            "patch": SemVerIncrement.PATCH,
+        }
+        bump_map_major_version_zero = {
+            "major": SemVerIncrement.MINOR,
+            "bang": SemVerIncrement.MINOR,
+            "minor": SemVerIncrement.MINOR,
+            "patch": SemVerIncrement.PATCH,
+        }
+        rule = CustomBumpRule(pattern, bump_map, bump_map_major_version_zero)
+
+        # Test with multiple version tags
+        assert (
+            rule.get_increment("major!: drop support for Python 2.7", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            rule.get_increment("major!: drop support for Python 2.7", True)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            rule.get_increment("major: drop support for Python 2.7", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            rule.get_increment("major: drop support for Python 2.7", True)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            rule.get_increment("patch!: drop support for Python 2.7", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            rule.get_increment("patch!: drop support for Python 2.7", True)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            rule.get_increment("patch: drop support for Python 2.7", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            rule.get_increment("patch: drop support for Python 2.7", True)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            rule.get_increment("minor: add new feature", False) == SemVerIncrement.MINOR
+        )
+        assert (
+            rule.get_increment("minor: add new feature", True) == SemVerIncrement.MINOR
+        )
+        assert rule.get_increment("patch: fix bug", False) == SemVerIncrement.PATCH
+        assert rule.get_increment("patch: fix bug", True) == SemVerIncrement.PATCH
+
+
+class TestCustomBumpRuleWithDefault:
+    @pytest.fixture
+    def custom_bump_rule(self):
+        return CustomBumpRule(
+            BUMP_PATTERN,
+            SemVerIncrement.safe_cast_dict(BUMP_MAP),
+            SemVerIncrement.safe_cast_dict(BUMP_MAP_MAJOR_VERSION_ZERO),
+        )
+
+    def test_breaking_change_with_bang(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("feat!: breaking change", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            custom_bump_rule.get_increment("fix!: breaking change", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            custom_bump_rule.get_increment("feat!: breaking change", True)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            custom_bump_rule.get_increment("fix!: breaking change", True)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_breaking_change_type(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("BREAKING CHANGE: major change", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            custom_bump_rule.get_increment("BREAKING-CHANGE: major change", False)
+            == SemVerIncrement.MAJOR
+        )
+        assert (
+            custom_bump_rule.get_increment("BREAKING CHANGE: major change", True)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            custom_bump_rule.get_increment("BREAKING-CHANGE: major change", True)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_feat_commit(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("feat: add new feature", False)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            custom_bump_rule.get_increment("feat: add new feature", True)
+            == SemVerIncrement.MINOR
+        )
+
+    def test_fix_commit(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("fix: fix bug", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            custom_bump_rule.get_increment("fix: fix bug", True)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_refactor_commit(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("refactor: restructure code", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            custom_bump_rule.get_increment("refactor: restructure code", True)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_perf_commit(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("perf: improve performance", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            custom_bump_rule.get_increment("perf: improve performance", True)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_commit_with_scope(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("feat(api): add new endpoint", False)
+            == SemVerIncrement.MINOR
+        )
+        assert (
+            custom_bump_rule.get_increment("fix(ui): fix button alignment", False)
+            == SemVerIncrement.PATCH
+        )
+        assert (
+            custom_bump_rule.get_increment("refactor(core): restructure", False)
+            == SemVerIncrement.PATCH
+        )
+
+    def test_no_match(self, custom_bump_rule):
+        assert (
+            custom_bump_rule.get_increment("docs: update documentation", False) is None
+        )
+        assert custom_bump_rule.get_increment("style: format code", False) is None
+        assert custom_bump_rule.get_increment("test: add unit tests", False) is None
+        assert (
+            custom_bump_rule.get_increment("build: update build config", False) is None
+        )
+        assert custom_bump_rule.get_increment("ci: update CI pipeline", False) is None
+
+    def test_with_find_increment_by_callable(self, custom_bump_rule):
+        commit_messages = [
+            "feat!: breaking change",
+            "fix: bug fix",
+            "perf: improve performance",
+        ]
+        assert (
+            SemVerIncrement.get_highest_by_messages(
+                commit_messages, lambda x: custom_bump_rule.get_increment(x, False)
+            )
+            == SemVerIncrement.MAJOR
+        )
+
+
+class TestGetHighest:
+    def test_get_highest_with_major(self):
+        increments = [
+            SemVerIncrement.PATCH,
+            SemVerIncrement.MINOR,
+            SemVerIncrement.MAJOR,
+        ]
+        assert SemVerIncrement.get_highest(increments) == SemVerIncrement.MAJOR
+
+    def test_get_highest_with_minor(self):
+        increments = [SemVerIncrement.PATCH, SemVerIncrement.MINOR, None]
+        assert SemVerIncrement.get_highest(increments) == SemVerIncrement.MINOR
+
+    def test_get_highest_with_patch(self):
+        increments = [SemVerIncrement.PATCH, None, None]
+        assert SemVerIncrement.get_highest(increments) == SemVerIncrement.PATCH
+
+    def test_get_highest_with_none(self):
+        increments = [None, None, None]
+        assert SemVerIncrement.get_highest(increments) is None
+
+    def test_get_highest_empty(self):
+        increments = []
+        assert SemVerIncrement.get_highest(increments) is None
+
+    def test_get_highest_mixed_order(self):
+        increments = [
+            SemVerIncrement.MAJOR,
+            SemVerIncrement.PATCH,
+            SemVerIncrement.MINOR,
+        ]
+        assert SemVerIncrement.get_highest(increments) == SemVerIncrement.MAJOR
+
+    def test_get_highest_with_none_values(self):
+        increments = [None, SemVerIncrement.MINOR, None, SemVerIncrement.PATCH]
+        assert SemVerIncrement.get_highest(increments) == SemVerIncrement.MINOR
+
+
+class TestSafeCast:
+    def test_safe_cast_valid_strings(self):
+        assert SemVerIncrement.safe_cast("MAJOR") == SemVerIncrement.MAJOR
+        assert SemVerIncrement.safe_cast("MINOR") == SemVerIncrement.MINOR
+        assert SemVerIncrement.safe_cast("PATCH") == SemVerIncrement.PATCH
+
+    def test_safe_cast_invalid_strings(self):
+        assert SemVerIncrement.safe_cast("invalid") is None
+        assert SemVerIncrement.safe_cast("major") is None  # case sensitive
+        assert SemVerIncrement.safe_cast("") is None
+
+    def test_safe_cast_non_string_values(self):
+        assert SemVerIncrement.safe_cast(None) is None
+        assert SemVerIncrement.safe_cast(1) is None
+        assert SemVerIncrement.safe_cast(True) is None
+        assert SemVerIncrement.safe_cast([]) is None
+        assert SemVerIncrement.safe_cast({}) is None
+        assert (
+            SemVerIncrement.safe_cast(SemVerIncrement.MAJOR) is None
+        )  # enum value itself
diff --git a/tests/test_version_scheme_pep440.py b/tests/test_version_scheme_pep440.py
index a983dad14a..e512dd2d39 100644
--- a/tests/test_version_scheme_pep440.py
+++ b/tests/test_version_scheme_pep440.py
@@ -3,184 +3,188 @@
 
 import pytest
 
-from commitizen.version_schemes import Pep440, VersionProtocol
+from commitizen.bump_rule import SemVerIncrement
+from commitizen.version_schemes import Pep440, Prerelease, VersionProtocol
 
 simple_flow = [
-    (("0.1.0", "PATCH", None, 0, None), "0.1.1"),
-    (("0.1.0", "PATCH", None, 0, 1), "0.1.1.dev1"),
-    (("0.1.1", "MINOR", None, 0, None), "0.2.0"),
-    (("0.2.0", "MINOR", None, 0, None), "0.3.0"),
-    (("0.2.0", "MINOR", None, 0, 1), "0.3.0.dev1"),
-    (("0.3.0", "PATCH", None, 0, None), "0.3.1"),
-    (("0.3.0", "PATCH", "alpha", 0, None), "0.3.1a0"),
-    (("0.3.1a0", None, "alpha", 0, None), "0.3.1a1"),
-    (("0.3.0", "PATCH", "alpha", 1, None), "0.3.1a1"),
-    (("0.3.1a0", None, "alpha", 1, None), "0.3.1a1"),
+    (("0.1.0", SemVerIncrement.PATCH, None, 0, None), "0.1.1"),
+    (("0.1.0", SemVerIncrement.PATCH, None, 0, 1), "0.1.1.dev1"),
+    (("0.1.1", SemVerIncrement.MINOR, None, 0, None), "0.2.0"),
+    (("0.2.0", SemVerIncrement.MINOR, None, 0, None), "0.3.0"),
+    (("0.2.0", SemVerIncrement.MINOR, None, 0, 1), "0.3.0.dev1"),
+    (("0.3.0", SemVerIncrement.PATCH, None, 0, None), "0.3.1"),
+    (("0.3.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "0.3.1a0"),
+    (("0.3.1a0", None, Prerelease.ALPHA, 0, None), "0.3.1a1"),
+    (("0.3.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 1, None), "0.3.1a1"),
+    (("0.3.1a0", None, Prerelease.ALPHA, 1, None), "0.3.1a1"),
     (("0.3.1a0", None, None, 0, None), "0.3.1"),
-    (("0.3.1", "PATCH", None, 0, None), "0.3.2"),
-    (("0.4.2", "MAJOR", "alpha", 0, None), "1.0.0a0"),
-    (("1.0.0a0", None, "alpha", 0, None), "1.0.0a1"),
-    (("1.0.0a1", None, "alpha", 0, None), "1.0.0a2"),
-    (("1.0.0a1", None, "alpha", 0, 1), "1.0.0a2.dev1"),
-    (("1.0.0a2.dev0", None, "alpha", 0, 1), "1.0.0a3.dev1"),
-    (("1.0.0a2.dev0", None, "alpha", 0, 0), "1.0.0a3.dev0"),
-    (("1.0.0a1", None, "beta", 0, None), "1.0.0b0"),
-    (("1.0.0b0", None, "beta", 0, None), "1.0.0b1"),
-    (("1.0.0b1", None, "rc", 0, None), "1.0.0rc0"),
-    (("1.0.0rc0", None, "rc", 0, None), "1.0.0rc1"),
-    (("1.0.0rc0", None, "rc", 0, 1), "1.0.0rc1.dev1"),
-    (("1.0.0rc0", "PATCH", None, 0, None), "1.0.0"),
-    (("1.0.0a3.dev0", None, "beta", 0, None), "1.0.0b0"),
-    (("1.0.0", "PATCH", None, 0, None), "1.0.1"),
-    (("1.0.1", "PATCH", None, 0, None), "1.0.2"),
-    (("1.0.2", "MINOR", None, 0, None), "1.1.0"),
-    (("1.1.0", "MINOR", None, 0, None), "1.2.0"),
-    (("1.2.0", "PATCH", None, 0, None), "1.2.1"),
-    (("1.2.1", "MAJOR", None, 0, None), "2.0.0"),
+    (("0.3.1", SemVerIncrement.PATCH, None, 0, None), "0.3.2"),
+    (("0.4.2", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "1.0.0a0"),
+    (("1.0.0a0", None, Prerelease.ALPHA, 0, None), "1.0.0a1"),
+    (("1.0.0a1", None, Prerelease.ALPHA, 0, None), "1.0.0a2"),
+    (("1.0.0a1", None, Prerelease.ALPHA, 0, 1), "1.0.0a2.dev1"),
+    (("1.0.0a2.dev0", None, Prerelease.ALPHA, 0, 1), "1.0.0a3.dev1"),
+    (("1.0.0a2.dev0", None, Prerelease.ALPHA, 0, 0), "1.0.0a3.dev0"),
+    (("1.0.0a1", None, Prerelease.BETA, 0, None), "1.0.0b0"),
+    (("1.0.0b0", None, Prerelease.BETA, 0, None), "1.0.0b1"),
+    (("1.0.0b1", None, Prerelease.RC, 0, None), "1.0.0rc0"),
+    (("1.0.0rc0", None, Prerelease.RC, 0, None), "1.0.0rc1"),
+    (("1.0.0rc0", None, Prerelease.RC, 0, 1), "1.0.0rc1.dev1"),
+    (("1.0.0rc0", SemVerIncrement.PATCH, None, 0, None), "1.0.0"),
+    (("1.0.0a3.dev0", None, Prerelease.BETA, 0, None), "1.0.0b0"),
+    (("1.0.0", SemVerIncrement.PATCH, None, 0, None), "1.0.1"),
+    (("1.0.1", SemVerIncrement.PATCH, None, 0, None), "1.0.2"),
+    (("1.0.2", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1.1.0", SemVerIncrement.MINOR, None, 0, None), "1.2.0"),
+    (("1.2.0", SemVerIncrement.PATCH, None, 0, None), "1.2.1"),
+    (("1.2.1", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
 ]
 
 local_versions = [
-    (("4.5.0+0.1.0", "PATCH", None, 0, None), "4.5.0+0.1.1"),
-    (("4.5.0+0.1.1", "MINOR", None, 0, None), "4.5.0+0.2.0"),
-    (("4.5.0+0.2.0", "MAJOR", None, 0, None), "4.5.0+1.0.0"),
+    (("4.5.0+0.1.0", SemVerIncrement.PATCH, None, 0, None), "4.5.0+0.1.1"),
+    (("4.5.0+0.1.1", SemVerIncrement.MINOR, None, 0, None), "4.5.0+0.2.0"),
+    (("4.5.0+0.2.0", SemVerIncrement.MAJOR, None, 0, None), "4.5.0+1.0.0"),
 ]
 
 # never bump backwards on pre-releases
 linear_prerelease_cases = [
-    (("0.1.1b1", None, "alpha", 0, None), "0.1.1b2"),
-    (("0.1.1rc0", None, "alpha", 0, None), "0.1.1rc1"),
-    (("0.1.1rc0", None, "beta", 0, None), "0.1.1rc1"),
+    (("0.1.1b1", None, Prerelease.ALPHA, 0, None), "0.1.1b2"),
+    (("0.1.1rc0", None, Prerelease.ALPHA, 0, None), "0.1.1rc1"),
+    (("0.1.1rc0", None, Prerelease.BETA, 0, None), "0.1.1rc1"),
 ]
 
 weird_cases = [
-    (("1.1", "PATCH", None, 0, None), "1.1.1"),
-    (("1", "MINOR", None, 0, None), "1.1.0"),
-    (("1", "MAJOR", None, 0, None), "2.0.0"),
-    (("1a0", None, "alpha", 0, None), "1.0.0a1"),
-    (("1a0", None, "alpha", 1, None), "1.0.0a1"),
-    (("1", None, "beta", 0, None), "1.0.0b0"),
-    (("1", None, "beta", 1, None), "1.0.0b1"),
-    (("1beta", None, "beta", 0, None), "1.0.0b1"),
-    (("1.0.0alpha1", None, "alpha", 0, None), "1.0.0a2"),
-    (("1", None, "rc", 0, None), "1.0.0rc0"),
-    (("1.0.0rc1+e20d7b57f3eb", "PATCH", None, 0, None), "1.0.0"),
+    (("1.1", SemVerIncrement.PATCH, None, 0, None), "1.1.1"),
+    (("1", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
+    (("1a0", None, Prerelease.ALPHA, 0, None), "1.0.0a1"),
+    (("1a0", None, Prerelease.ALPHA, 1, None), "1.0.0a1"),
+    (("1", None, Prerelease.BETA, 0, None), "1.0.0b0"),
+    (("1", None, Prerelease.BETA, 1, None), "1.0.0b1"),
+    (("1beta", None, Prerelease.BETA, 0, None), "1.0.0b1"),
+    (("1.0.0alpha1", None, Prerelease.ALPHA, 0, None), "1.0.0a2"),
+    (("1", None, Prerelease.RC, 0, None), "1.0.0rc0"),
+    (("1.0.0rc1+e20d7b57f3eb", SemVerIncrement.PATCH, None, 0, None), "1.0.0"),
 ]
 
 # test driven development
 tdd_cases = [
-    (("0.1.1", "PATCH", None, 0, None), "0.1.2"),
-    (("0.1.1", "MINOR", None, 0, None), "0.2.0"),
-    (("2.1.1", "MAJOR", None, 0, None), "3.0.0"),
-    (("0.9.0", "PATCH", "alpha", 0, None), "0.9.1a0"),
-    (("0.9.0", "MINOR", "alpha", 0, None), "0.10.0a0"),
-    (("0.9.0", "MAJOR", "alpha", 0, None), "1.0.0a0"),
-    (("0.9.0", "MAJOR", "alpha", 1, None), "1.0.0a1"),
-    (("1.0.0a2", None, "beta", 0, None), "1.0.0b0"),
-    (("1.0.0a2", None, "beta", 1, None), "1.0.0b1"),
-    (("1.0.0beta1", None, "rc", 0, None), "1.0.0rc0"),
-    (("1.0.0rc1", None, "rc", 0, None), "1.0.0rc2"),
+    (("0.1.1", SemVerIncrement.PATCH, None, 0, None), "0.1.2"),
+    (("0.1.1", SemVerIncrement.MINOR, None, 0, None), "0.2.0"),
+    (("2.1.1", SemVerIncrement.MAJOR, None, 0, None), "3.0.0"),
+    (("0.9.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "0.9.1a0"),
+    (("0.9.0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "0.10.0a0"),
+    (("0.9.0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "1.0.0a0"),
+    (("0.9.0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 1, None), "1.0.0a1"),
+    (("1.0.0a2", None, Prerelease.BETA, 0, None), "1.0.0b0"),
+    (("1.0.0a2", None, Prerelease.BETA, 1, None), "1.0.0b1"),
+    (("1.0.0beta1", None, Prerelease.RC, 0, None), "1.0.0rc0"),
+    (("1.0.0rc1", None, Prerelease.RC, 0, None), "1.0.0rc2"),
 ]
 
 # additional pre-release tests run through various release scenarios
 prerelease_cases = [
     #
-    (("3.3.3", "PATCH", "alpha", 0, None), "3.3.4a0"),
-    (("3.3.4a0", "PATCH", "alpha", 0, None), "3.3.4a1"),
-    (("3.3.4a1", "MINOR", "alpha", 0, None), "3.4.0a0"),
-    (("3.4.0a0", "PATCH", "alpha", 0, None), "3.4.0a1"),
-    (("3.4.0a1", "MINOR", "alpha", 0, None), "3.4.0a2"),
-    (("3.4.0a2", "MAJOR", "alpha", 0, None), "4.0.0a0"),
-    (("4.0.0a0", "PATCH", "alpha", 0, None), "4.0.0a1"),
-    (("4.0.0a1", "MINOR", "alpha", 0, None), "4.0.0a2"),
-    (("4.0.0a2", "MAJOR", "alpha", 0, None), "4.0.0a3"),
+    (("3.3.3", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "3.3.4a0"),
+    (("3.3.4a0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "3.3.4a1"),
+    (("3.3.4a1", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "3.4.0a0"),
+    (("3.4.0a0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "3.4.0a1"),
+    (("3.4.0a1", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "3.4.0a2"),
+    (("3.4.0a2", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "4.0.0a0"),
+    (("4.0.0a0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "4.0.0a1"),
+    (("4.0.0a1", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "4.0.0a2"),
+    (("4.0.0a2", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "4.0.0a3"),
     #
-    (("1.0.0", "PATCH", "alpha", 0, None), "1.0.1a0"),
-    (("1.0.1a0", "PATCH", "alpha", 0, None), "1.0.1a1"),
-    (("1.0.1a1", "MINOR", "alpha", 0, None), "1.1.0a0"),
-    (("1.1.0a0", "PATCH", "alpha", 0, None), "1.1.0a1"),
-    (("1.1.0a1", "MINOR", "alpha", 0, None), "1.1.0a2"),
-    (("1.1.0a2", "MAJOR", "alpha", 0, None), "2.0.0a0"),
+    (("1.0.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "1.0.1a0"),
+    (("1.0.1a0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "1.0.1a1"),
+    (("1.0.1a1", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "1.1.0a0"),
+    (("1.1.0a0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "1.1.0a1"),
+    (("1.1.0a1", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "1.1.0a2"),
+    (("1.1.0a2", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "2.0.0a0"),
     #
-    (("1.0.0", "MINOR", "alpha", 0, None), "1.1.0a0"),
-    (("1.1.0a0", "PATCH", "alpha", 0, None), "1.1.0a1"),
-    (("1.1.0a1", "MINOR", "alpha", 0, None), "1.1.0a2"),
-    (("1.1.0a2", "PATCH", "alpha", 0, None), "1.1.0a3"),
-    (("1.1.0a3", "MAJOR", "alpha", 0, None), "2.0.0a0"),
+    (("1.0.0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "1.1.0a0"),
+    (("1.1.0a0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "1.1.0a1"),
+    (("1.1.0a1", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "1.1.0a2"),
+    (("1.1.0a2", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "1.1.0a3"),
+    (("1.1.0a3", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "2.0.0a0"),
     #
-    (("1.0.0", "MAJOR", "alpha", 0, None), "2.0.0a0"),
-    (("2.0.0a0", "MINOR", "alpha", 0, None), "2.0.0a1"),
-    (("2.0.0a1", "PATCH", "alpha", 0, None), "2.0.0a2"),
-    (("2.0.0a2", "MAJOR", "alpha", 0, None), "2.0.0a3"),
-    (("2.0.0a3", "MINOR", "alpha", 0, None), "2.0.0a4"),
-    (("2.0.0a4", "PATCH", "alpha", 0, None), "2.0.0a5"),
-    (("2.0.0a5", "MAJOR", "alpha", 0, None), "2.0.0a6"),
+    (("1.0.0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "2.0.0a0"),
+    (("2.0.0a0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "2.0.0a1"),
+    (("2.0.0a1", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "2.0.0a2"),
+    (("2.0.0a2", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "2.0.0a3"),
+    (("2.0.0a3", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "2.0.0a4"),
+    (("2.0.0a4", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "2.0.0a5"),
+    (("2.0.0a5", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "2.0.0a6"),
     #
-    (("2.0.0b0", "MINOR", "alpha", 0, None), "2.0.0b1"),
-    (("2.0.0b0", "PATCH", "alpha", 0, None), "2.0.0b1"),
+    (("2.0.0b0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "2.0.0b1"),
+    (("2.0.0b0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "2.0.0b1"),
     #
-    (("1.0.1a0", "PATCH", None, 0, None), "1.0.1"),
-    (("1.0.1a0", "MINOR", None, 0, None), "1.1.0"),
-    (("1.0.1a0", "MAJOR", None, 0, None), "2.0.0"),
+    (("1.0.1a0", SemVerIncrement.PATCH, None, 0, None), "1.0.1"),
+    (("1.0.1a0", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1.0.1a0", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
     #
-    (("1.1.0a0", "PATCH", None, 0, None), "1.1.0"),
-    (("1.1.0a0", "MINOR", None, 0, None), "1.1.0"),
-    (("1.1.0a0", "MAJOR", None, 0, None), "2.0.0"),
+    (("1.1.0a0", SemVerIncrement.PATCH, None, 0, None), "1.1.0"),
+    (("1.1.0a0", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1.1.0a0", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
     #
-    (("2.0.0a0", "MINOR", None, 0, None), "2.0.0"),
-    (("2.0.0a0", "MAJOR", None, 0, None), "2.0.0"),
-    (("2.0.0a0", "PATCH", None, 0, None), "2.0.0"),
+    (("2.0.0a0", SemVerIncrement.MINOR, None, 0, None), "2.0.0"),
+    (("2.0.0a0", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
+    (("2.0.0a0", SemVerIncrement.PATCH, None, 0, None), "2.0.0"),
     #
     (("3.0.0a1", None, None, 0, None), "3.0.0"),
     (("3.0.0b1", None, None, 0, None), "3.0.0"),
     (("3.0.0rc1", None, None, 0, None), "3.0.0"),
     #
-    (("3.1.4", None, "alpha", 0, None), "3.1.4a0"),
-    (("3.1.4", None, "beta", 0, None), "3.1.4b0"),
-    (("3.1.4", None, "rc", 0, None), "3.1.4rc0"),
+    (("3.1.4", None, Prerelease.ALPHA, 0, None), "3.1.4a0"),
+    (("3.1.4", None, Prerelease.BETA, 0, None), "3.1.4b0"),
+    (("3.1.4", None, Prerelease.RC, 0, None), "3.1.4rc0"),
     #
-    (("3.1.4", None, "alpha", 0, None), "3.1.4a0"),
-    (("3.1.4a0", "PATCH", "alpha", 0, None), "3.1.4a1"),  # UNEXPECTED!
-    (("3.1.4a0", "MINOR", "alpha", 0, None), "3.2.0a0"),
-    (("3.1.4a0", "MAJOR", "alpha", 0, None), "4.0.0a0"),
+    (("3.1.4", None, Prerelease.ALPHA, 0, None), "3.1.4a0"),
+    (
+        ("3.1.4a0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None),
+        "3.1.4a1",
+    ),  # UNEXPECTED!
+    (("3.1.4a0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "3.2.0a0"),
+    (("3.1.4a0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "4.0.0a0"),
 ]
 
 exact_cases = [
-    (("1.0.0", "PATCH", None, 0, None), "1.0.1"),
-    (("1.0.0", "MINOR", None, 0, None), "1.1.0"),
+    (("1.0.0", SemVerIncrement.PATCH, None, 0, None), "1.0.1"),
+    (("1.0.0", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
     # with exact_increment=False: "1.0.0b0"
-    (("1.0.0a1", "PATCH", "beta", 0, None), "1.0.1b0"),
+    (("1.0.0a1", SemVerIncrement.PATCH, Prerelease.BETA, 0, None), "1.0.1b0"),
     # with exact_increment=False: "1.0.0b1"
-    (("1.0.0b0", "PATCH", "beta", 0, None), "1.0.1b0"),
+    (("1.0.0b0", SemVerIncrement.PATCH, Prerelease.BETA, 0, None), "1.0.1b0"),
     # with exact_increment=False: "1.0.0rc0"
-    (("1.0.0b1", "PATCH", "rc", 0, None), "1.0.1rc0"),
+    (("1.0.0b1", SemVerIncrement.PATCH, Prerelease.RC, 0, None), "1.0.1rc0"),
     # with exact_increment=False: "1.0.0-rc1"
-    (("1.0.0rc0", "PATCH", "rc", 0, None), "1.0.1rc0"),
+    (("1.0.0rc0", SemVerIncrement.PATCH, Prerelease.RC, 0, None), "1.0.1rc0"),
     # with exact_increment=False: "1.0.0rc1-dev1"
-    (("1.0.0rc0", "PATCH", "rc", 0, 1), "1.0.1rc0.dev1"),
+    (("1.0.0rc0", SemVerIncrement.PATCH, Prerelease.RC, 0, 1), "1.0.1rc0.dev1"),
     # with exact_increment=False: "1.0.0b0"
-    (("1.0.0a1", "MINOR", "beta", 0, None), "1.1.0b0"),
+    (("1.0.0a1", SemVerIncrement.MINOR, Prerelease.BETA, 0, None), "1.1.0b0"),
     # with exact_increment=False: "1.0.0b1"
-    (("1.0.0b0", "MINOR", "beta", 0, None), "1.1.0b0"),
+    (("1.0.0b0", SemVerIncrement.MINOR, Prerelease.BETA, 0, None), "1.1.0b0"),
     # with exact_increment=False: "1.0.0b1"
-    (("1.0.0b0", "MINOR", "alpha", 0, None), "1.1.0a0"),
+    (("1.0.0b0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "1.1.0a0"),
     # with exact_increment=False: "1.0.0rc0"
-    (("1.0.0b1", "MINOR", "rc", 0, None), "1.1.0rc0"),
+    (("1.0.0b1", SemVerIncrement.MINOR, Prerelease.RC, 0, None), "1.1.0rc0"),
     # with exact_increment=False: "1.0.0rc1"
-    (("1.0.0rc0", "MINOR", "rc", 0, None), "1.1.0rc0"),
+    (("1.0.0rc0", SemVerIncrement.MINOR, Prerelease.RC, 0, None), "1.1.0rc0"),
     # with exact_increment=False: "1.0.0rc1-dev1"
-    (("1.0.0rc0", "MINOR", "rc", 0, 1), "1.1.0rc0.dev1"),
+    (("1.0.0rc0", SemVerIncrement.MINOR, Prerelease.RC, 0, 1), "1.1.0rc0.dev1"),
     # with exact_increment=False: "2.0.0"
-    (("2.0.0b0", "MAJOR", None, 0, None), "3.0.0"),
+    (("2.0.0b0", SemVerIncrement.MAJOR, None, 0, None), "3.0.0"),
     # with exact_increment=False: "2.0.0"
-    (("2.0.0b0", "MINOR", None, 0, None), "2.1.0"),
+    (("2.0.0b0", SemVerIncrement.MINOR, None, 0, None), "2.1.0"),
     # with exact_increment=False: "2.0.0"
-    (("2.0.0b0", "PATCH", None, 0, None), "2.0.1"),
+    (("2.0.0b0", SemVerIncrement.PATCH, None, 0, None), "2.0.1"),
     # same with exact_increment=False
-    (("2.0.0b0", "MAJOR", "alpha", 0, None), "3.0.0a0"),
+    (("2.0.0b0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "3.0.0a0"),
     # with exact_increment=False: "2.0.0b1"
-    (("2.0.0b0", "MINOR", "alpha", 0, None), "2.1.0a0"),
+    (("2.0.0b0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "2.1.0a0"),
     # with exact_increment=False: "2.0.0b1"
-    (("2.0.0b0", "PATCH", "alpha", 0, None), "2.0.1a0"),
+    (("2.0.0b0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "2.0.1a0"),
 ]
 
 
diff --git a/tests/test_version_scheme_semver.py b/tests/test_version_scheme_semver.py
index 8785717a34..f1eb43d11e 100644
--- a/tests/test_version_scheme_semver.py
+++ b/tests/test_version_scheme_semver.py
@@ -3,121 +3,122 @@
 
 import pytest
 
-from commitizen.version_schemes import SemVer, VersionProtocol
+from commitizen.bump_rule import SemVerIncrement
+from commitizen.version_schemes import Prerelease, SemVer, VersionProtocol
 
 simple_flow = [
-    (("0.1.0", "PATCH", None, 0, None), "0.1.1"),
-    (("0.1.0", "PATCH", None, 0, 1), "0.1.1-dev1"),
-    (("0.1.1", "MINOR", None, 0, None), "0.2.0"),
-    (("0.2.0", "MINOR", None, 0, None), "0.3.0"),
-    (("0.2.0", "MINOR", None, 0, 1), "0.3.0-dev1"),
-    (("0.3.0", "PATCH", None, 0, None), "0.3.1"),
-    (("0.3.0", "PATCH", "alpha", 0, None), "0.3.1-a0"),
-    (("0.3.1a0", None, "alpha", 0, None), "0.3.1-a1"),
-    (("0.3.0", "PATCH", "alpha", 1, None), "0.3.1-a1"),
-    (("0.3.1a0", None, "alpha", 1, None), "0.3.1-a1"),
+    (("0.1.0", SemVerIncrement.PATCH, None, 0, None), "0.1.1"),
+    (("0.1.0", SemVerIncrement.PATCH, None, 0, 1), "0.1.1-dev1"),
+    (("0.1.1", SemVerIncrement.MINOR, None, 0, None), "0.2.0"),
+    (("0.2.0", SemVerIncrement.MINOR, None, 0, None), "0.3.0"),
+    (("0.2.0", SemVerIncrement.MINOR, None, 0, 1), "0.3.0-dev1"),
+    (("0.3.0", SemVerIncrement.PATCH, None, 0, None), "0.3.1"),
+    (("0.3.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "0.3.1-a0"),
+    (("0.3.1a0", None, Prerelease.ALPHA, 0, None), "0.3.1-a1"),
+    (("0.3.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 1, None), "0.3.1-a1"),
+    (("0.3.1a0", None, Prerelease.ALPHA, 1, None), "0.3.1-a1"),
     (("0.3.1a0", None, None, 0, None), "0.3.1"),
-    (("0.3.1", "PATCH", None, 0, None), "0.3.2"),
-    (("0.4.2", "MAJOR", "alpha", 0, None), "1.0.0-a0"),
-    (("1.0.0a0", None, "alpha", 0, None), "1.0.0-a1"),
-    (("1.0.0a1", None, "alpha", 0, None), "1.0.0-a2"),
-    (("1.0.0a1", None, "alpha", 0, 1), "1.0.0-a2-dev1"),
-    (("1.0.0a2.dev0", None, "alpha", 0, 1), "1.0.0-a3-dev1"),
-    (("1.0.0a2.dev0", None, "alpha", 0, 0), "1.0.0-a3-dev0"),
-    (("1.0.0a1", None, "beta", 0, None), "1.0.0-b0"),
-    (("1.0.0b0", None, "beta", 0, None), "1.0.0-b1"),
-    (("1.0.0b1", None, "rc", 0, None), "1.0.0-rc0"),
-    (("1.0.0rc0", None, "rc", 0, None), "1.0.0-rc1"),
-    (("1.0.0rc0", None, "rc", 0, 1), "1.0.0-rc1-dev1"),
-    (("1.0.0rc0", "PATCH", None, 0, None), "1.0.0"),
-    (("1.0.0a3.dev0", None, "beta", 0, None), "1.0.0-b0"),
-    (("1.0.0", "PATCH", None, 0, None), "1.0.1"),
-    (("1.0.1", "PATCH", None, 0, None), "1.0.2"),
-    (("1.0.2", "MINOR", None, 0, None), "1.1.0"),
-    (("1.1.0", "MINOR", None, 0, None), "1.2.0"),
-    (("1.2.0", "PATCH", None, 0, None), "1.2.1"),
-    (("1.2.1", "MAJOR", None, 0, None), "2.0.0"),
+    (("0.3.1", SemVerIncrement.PATCH, None, 0, None), "0.3.2"),
+    (("0.4.2", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "1.0.0-a0"),
+    (("1.0.0a0", None, Prerelease.ALPHA, 0, None), "1.0.0-a1"),
+    (("1.0.0a1", None, Prerelease.ALPHA, 0, None), "1.0.0-a2"),
+    (("1.0.0a1", None, Prerelease.ALPHA, 0, 1), "1.0.0-a2-dev1"),
+    (("1.0.0a2.dev0", None, Prerelease.ALPHA, 0, 1), "1.0.0-a3-dev1"),
+    (("1.0.0a2.dev0", None, Prerelease.ALPHA, 0, 0), "1.0.0-a3-dev0"),
+    (("1.0.0a1", None, Prerelease.BETA, 0, None), "1.0.0-b0"),
+    (("1.0.0b0", None, Prerelease.BETA, 0, None), "1.0.0-b1"),
+    (("1.0.0b1", None, Prerelease.RC, 0, None), "1.0.0-rc0"),
+    (("1.0.0rc0", None, Prerelease.RC, 0, None), "1.0.0-rc1"),
+    (("1.0.0rc0", None, Prerelease.RC, 0, 1), "1.0.0-rc1-dev1"),
+    (("1.0.0rc0", SemVerIncrement.PATCH, None, 0, None), "1.0.0"),
+    (("1.0.0a3.dev0", None, Prerelease.BETA, 0, None), "1.0.0-b0"),
+    (("1.0.0", SemVerIncrement.PATCH, None, 0, None), "1.0.1"),
+    (("1.0.1", SemVerIncrement.PATCH, None, 0, None), "1.0.2"),
+    (("1.0.2", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1.1.0", SemVerIncrement.MINOR, None, 0, None), "1.2.0"),
+    (("1.2.0", SemVerIncrement.PATCH, None, 0, None), "1.2.1"),
+    (("1.2.1", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
 ]
 
 local_versions = [
-    (("4.5.0+0.1.0", "PATCH", None, 0, None), "4.5.0+0.1.1"),
-    (("4.5.0+0.1.1", "MINOR", None, 0, None), "4.5.0+0.2.0"),
-    (("4.5.0+0.2.0", "MAJOR", None, 0, None), "4.5.0+1.0.0"),
+    (("4.5.0+0.1.0", SemVerIncrement.PATCH, None, 0, None), "4.5.0+0.1.1"),
+    (("4.5.0+0.1.1", SemVerIncrement.MINOR, None, 0, None), "4.5.0+0.2.0"),
+    (("4.5.0+0.2.0", SemVerIncrement.MAJOR, None, 0, None), "4.5.0+1.0.0"),
 ]
 
 # never bump backwards on pre-releases
 linear_prerelease_cases = [
-    (("0.1.1b1", None, "alpha", 0, None), "0.1.1-b2"),
-    (("0.1.1rc0", None, "alpha", 0, None), "0.1.1-rc1"),
-    (("0.1.1rc0", None, "beta", 0, None), "0.1.1-rc1"),
+    (("0.1.1b1", None, Prerelease.ALPHA, 0, None), "0.1.1-b2"),
+    (("0.1.1rc0", None, Prerelease.ALPHA, 0, None), "0.1.1-rc1"),
+    (("0.1.1rc0", None, Prerelease.BETA, 0, None), "0.1.1-rc1"),
 ]
 
 weird_cases = [
-    (("1.1", "PATCH", None, 0, None), "1.1.1"),
-    (("1", "MINOR", None, 0, None), "1.1.0"),
-    (("1", "MAJOR", None, 0, None), "2.0.0"),
-    (("1a0", None, "alpha", 0, None), "1.0.0-a1"),
-    (("1a0", None, "alpha", 1, None), "1.0.0-a1"),
-    (("1", None, "beta", 0, None), "1.0.0-b0"),
-    (("1", None, "beta", 1, None), "1.0.0-b1"),
-    (("1beta", None, "beta", 0, None), "1.0.0-b1"),
-    (("1.0.0alpha1", None, "alpha", 0, None), "1.0.0-a2"),
-    (("1", None, "rc", 0, None), "1.0.0-rc0"),
-    (("1.0.0rc1+e20d7b57f3eb", "PATCH", None, 0, None), "1.0.0"),
+    (("1.1", SemVerIncrement.PATCH, None, 0, None), "1.1.1"),
+    (("1", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
+    (("1a0", None, Prerelease.ALPHA, 0, None), "1.0.0-a1"),
+    (("1a0", None, Prerelease.ALPHA, 1, None), "1.0.0-a1"),
+    (("1", None, Prerelease.BETA, 0, None), "1.0.0-b0"),
+    (("1", None, Prerelease.BETA, 1, None), "1.0.0-b1"),
+    (("1beta", None, Prerelease.BETA, 0, None), "1.0.0-b1"),
+    (("1.0.0alpha1", None, Prerelease.ALPHA, 0, None), "1.0.0-a2"),
+    (("1", None, Prerelease.RC, 0, None), "1.0.0-rc0"),
+    (("1.0.0rc1+e20d7b57f3eb", SemVerIncrement.PATCH, None, 0, None), "1.0.0"),
 ]
 
 # test driven development
 tdd_cases = [
-    (("0.1.1", "PATCH", None, 0, None), "0.1.2"),
-    (("0.1.1", "MINOR", None, 0, None), "0.2.0"),
-    (("2.1.1", "MAJOR", None, 0, None), "3.0.0"),
-    (("0.9.0", "PATCH", "alpha", 0, None), "0.9.1-a0"),
-    (("0.9.0", "MINOR", "alpha", 0, None), "0.10.0-a0"),
-    (("0.9.0", "MAJOR", "alpha", 0, None), "1.0.0-a0"),
-    (("0.9.0", "MAJOR", "alpha", 1, None), "1.0.0-a1"),
-    (("1.0.0a2", None, "beta", 0, None), "1.0.0-b0"),
-    (("1.0.0a2", None, "beta", 1, None), "1.0.0-b1"),
-    (("1.0.0beta1", None, "rc", 0, None), "1.0.0-rc0"),
-    (("1.0.0rc1", None, "rc", 0, None), "1.0.0-rc2"),
-    (("1.0.0-a0", None, "rc", 0, None), "1.0.0-rc0"),
-    (("1.0.0-alpha1", None, "alpha", 0, None), "1.0.0-a2"),
+    (("0.1.1", SemVerIncrement.PATCH, None, 0, None), "0.1.2"),
+    (("0.1.1", SemVerIncrement.MINOR, None, 0, None), "0.2.0"),
+    (("2.1.1", SemVerIncrement.MAJOR, None, 0, None), "3.0.0"),
+    (("0.9.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "0.9.1-a0"),
+    (("0.9.0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "0.10.0-a0"),
+    (("0.9.0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "1.0.0-a0"),
+    (("0.9.0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 1, None), "1.0.0-a1"),
+    (("1.0.0a2", None, Prerelease.BETA, 0, None), "1.0.0-b0"),
+    (("1.0.0a2", None, Prerelease.BETA, 1, None), "1.0.0-b1"),
+    (("1.0.0beta1", None, Prerelease.RC, 0, None), "1.0.0-rc0"),
+    (("1.0.0rc1", None, Prerelease.RC, 0, None), "1.0.0-rc2"),
+    (("1.0.0-a0", None, Prerelease.RC, 0, None), "1.0.0-rc0"),
+    (("1.0.0-alpha1", None, Prerelease.ALPHA, 0, None), "1.0.0-a2"),
 ]
 
 exact_cases = [
-    (("1.0.0", "PATCH", None, 0, None), "1.0.1"),
-    (("1.0.0", "MINOR", None, 0, None), "1.1.0"),
+    (("1.0.0", SemVerIncrement.PATCH, None, 0, None), "1.0.1"),
+    (("1.0.0", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
     # with exact_increment=False: "1.0.0-b0"
-    (("1.0.0a1", "PATCH", "beta", 0, None), "1.0.1-b0"),
+    (("1.0.0a1", SemVerIncrement.PATCH, Prerelease.BETA, 0, None), "1.0.1-b0"),
     # with exact_increment=False: "1.0.0-b1"
-    (("1.0.0b0", "PATCH", "beta", 0, None), "1.0.1-b0"),
+    (("1.0.0b0", SemVerIncrement.PATCH, Prerelease.BETA, 0, None), "1.0.1-b0"),
     # with exact_increment=False: "1.0.0-rc0"
-    (("1.0.0b1", "PATCH", "rc", 0, None), "1.0.1-rc0"),
+    (("1.0.0b1", SemVerIncrement.PATCH, Prerelease.RC, 0, None), "1.0.1-rc0"),
     # with exact_increment=False: "1.0.0-rc1"
-    (("1.0.0rc0", "PATCH", "rc", 0, None), "1.0.1-rc0"),
+    (("1.0.0rc0", SemVerIncrement.PATCH, Prerelease.RC, 0, None), "1.0.1-rc0"),
     # with exact_increment=False: "1.0.0-rc1-dev1"
-    (("1.0.0rc0", "PATCH", "rc", 0, 1), "1.0.1-rc0-dev1"),
+    (("1.0.0rc0", SemVerIncrement.PATCH, Prerelease.RC, 0, 1), "1.0.1-rc0-dev1"),
     # with exact_increment=False: "1.0.0-b0"
-    (("1.0.0a1", "MINOR", "beta", 0, None), "1.1.0-b0"),
+    (("1.0.0a1", SemVerIncrement.MINOR, Prerelease.BETA, 0, None), "1.1.0-b0"),
     # with exact_increment=False: "1.0.0-b1"
-    (("1.0.0b0", "MINOR", "beta", 0, None), "1.1.0-b0"),
+    (("1.0.0b0", SemVerIncrement.MINOR, Prerelease.BETA, 0, None), "1.1.0-b0"),
     # with exact_increment=False: "1.0.0-rc0"
-    (("1.0.0b1", "MINOR", "rc", 0, None), "1.1.0-rc0"),
+    (("1.0.0b1", SemVerIncrement.MINOR, Prerelease.RC, 0, None), "1.1.0-rc0"),
     # with exact_increment=False: "1.0.0-rc1"
-    (("1.0.0rc0", "MINOR", "rc", 0, None), "1.1.0-rc0"),
+    (("1.0.0rc0", SemVerIncrement.MINOR, Prerelease.RC, 0, None), "1.1.0-rc0"),
     # with exact_increment=False: "1.0.0-rc1-dev1"
-    (("1.0.0rc0", "MINOR", "rc", 0, 1), "1.1.0-rc0-dev1"),
+    (("1.0.0rc0", SemVerIncrement.MINOR, Prerelease.RC, 0, 1), "1.1.0-rc0-dev1"),
     # with exact_increment=False: "2.0.0"
-    (("2.0.0b0", "MAJOR", None, 0, None), "3.0.0"),
+    (("2.0.0b0", SemVerIncrement.MAJOR, None, 0, None), "3.0.0"),
     # with exact_increment=False: "2.0.0"
-    (("2.0.0b0", "MINOR", None, 0, None), "2.1.0"),
+    (("2.0.0b0", SemVerIncrement.MINOR, None, 0, None), "2.1.0"),
     # with exact_increment=False: "2.0.0"
-    (("2.0.0b0", "PATCH", None, 0, None), "2.0.1"),
+    (("2.0.0b0", SemVerIncrement.PATCH, None, 0, None), "2.0.1"),
     # same with exact_increment=False
-    (("2.0.0b0", "MAJOR", "alpha", 0, None), "3.0.0-a0"),
+    (("2.0.0b0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "3.0.0-a0"),
     # with exact_increment=False: "2.0.0b1"
-    (("2.0.0b0", "MINOR", "alpha", 0, None), "2.1.0-a0"),
+    (("2.0.0b0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "2.1.0-a0"),
     # with exact_increment=False: "2.0.0b1"
-    (("2.0.0b0", "PATCH", "alpha", 0, None), "2.0.1-a0"),
+    (("2.0.0b0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "2.0.1-a0"),
 ]
 
 
diff --git a/tests/test_version_scheme_semver2.py b/tests/test_version_scheme_semver2.py
index d18a058a7c..1e1fe14523 100644
--- a/tests/test_version_scheme_semver2.py
+++ b/tests/test_version_scheme_semver2.py
@@ -3,84 +3,85 @@
 
 import pytest
 
-from commitizen.version_schemes import SemVer2, VersionProtocol
+from commitizen.bump_rule import SemVerIncrement
+from commitizen.version_schemes import Prerelease, SemVer2, VersionProtocol
 
 simple_flow = [
-    (("0.1.0", "PATCH", None, 0, None), "0.1.1"),
-    (("0.1.0", "PATCH", None, 0, 1), "0.1.1-dev.1"),
-    (("0.1.1", "MINOR", None, 0, None), "0.2.0"),
-    (("0.2.0", "MINOR", None, 0, None), "0.3.0"),
-    (("0.2.0", "MINOR", None, 0, 1), "0.3.0-dev.1"),
-    (("0.3.0", "PATCH", None, 0, None), "0.3.1"),
-    (("0.3.0", "PATCH", "alpha", 0, None), "0.3.1-alpha.0"),
-    (("0.3.1-alpha.0", None, "alpha", 0, None), "0.3.1-alpha.1"),
-    (("0.3.0", "PATCH", "alpha", 1, None), "0.3.1-alpha.1"),
-    (("0.3.1-alpha.0", None, "alpha", 1, None), "0.3.1-alpha.1"),
+    (("0.1.0", SemVerIncrement.PATCH, None, 0, None), "0.1.1"),
+    (("0.1.0", SemVerIncrement.PATCH, None, 0, 1), "0.1.1-dev.1"),
+    (("0.1.1", SemVerIncrement.MINOR, None, 0, None), "0.2.0"),
+    (("0.2.0", SemVerIncrement.MINOR, None, 0, None), "0.3.0"),
+    (("0.2.0", SemVerIncrement.MINOR, None, 0, 1), "0.3.0-dev.1"),
+    (("0.3.0", SemVerIncrement.PATCH, None, 0, None), "0.3.1"),
+    (("0.3.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "0.3.1-alpha.0"),
+    (("0.3.1-alpha.0", None, Prerelease.ALPHA, 0, None), "0.3.1-alpha.1"),
+    (("0.3.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 1, None), "0.3.1-alpha.1"),
+    (("0.3.1-alpha.0", None, Prerelease.ALPHA, 1, None), "0.3.1-alpha.1"),
     (("0.3.1-alpha.0", None, None, 0, None), "0.3.1"),
-    (("0.3.1", "PATCH", None, 0, None), "0.3.2"),
-    (("0.4.2", "MAJOR", "alpha", 0, None), "1.0.0-alpha.0"),
-    (("1.0.0-alpha.0", None, "alpha", 0, None), "1.0.0-alpha.1"),
-    (("1.0.0-alpha.1", None, "alpha", 0, None), "1.0.0-alpha.2"),
-    (("1.0.0-alpha.1", None, "alpha", 0, 1), "1.0.0-alpha.2.dev.1"),
-    (("1.0.0-alpha.2.dev.0", None, "alpha", 0, 1), "1.0.0-alpha.3.dev.1"),
-    (("1.0.0-alpha.2.dev.0", None, "alpha", 0, 0), "1.0.0-alpha.3.dev.0"),
-    (("1.0.0-alpha.1", None, "beta", 0, None), "1.0.0-beta.0"),
-    (("1.0.0-beta.0", None, "beta", 0, None), "1.0.0-beta.1"),
-    (("1.0.0-beta.1", None, "rc", 0, None), "1.0.0-rc.0"),
-    (("1.0.0-rc.0", None, "rc", 0, None), "1.0.0-rc.1"),
-    (("1.0.0-rc.0", None, "rc", 0, 1), "1.0.0-rc.1.dev.1"),
-    (("1.0.0-rc.0", "PATCH", None, 0, None), "1.0.0"),
-    (("1.0.0-alpha.3.dev.0", None, "beta", 0, None), "1.0.0-beta.0"),
-    (("1.0.0", "PATCH", None, 0, None), "1.0.1"),
-    (("1.0.1", "PATCH", None, 0, None), "1.0.2"),
-    (("1.0.2", "MINOR", None, 0, None), "1.1.0"),
-    (("1.1.0", "MINOR", None, 0, None), "1.2.0"),
-    (("1.2.0", "PATCH", None, 0, None), "1.2.1"),
-    (("1.2.1", "MAJOR", None, 0, None), "2.0.0"),
+    (("0.3.1", SemVerIncrement.PATCH, None, 0, None), "0.3.2"),
+    (("0.4.2", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "1.0.0-alpha.0"),
+    (("1.0.0-alpha.0", None, Prerelease.ALPHA, 0, None), "1.0.0-alpha.1"),
+    (("1.0.0-alpha.1", None, Prerelease.ALPHA, 0, None), "1.0.0-alpha.2"),
+    (("1.0.0-alpha.1", None, Prerelease.ALPHA, 0, 1), "1.0.0-alpha.2.dev.1"),
+    (("1.0.0-alpha.2.dev.0", None, Prerelease.ALPHA, 0, 1), "1.0.0-alpha.3.dev.1"),
+    (("1.0.0-alpha.2.dev.0", None, Prerelease.ALPHA, 0, 0), "1.0.0-alpha.3.dev.0"),
+    (("1.0.0-alpha.1", None, Prerelease.BETA, 0, None), "1.0.0-beta.0"),
+    (("1.0.0-beta.0", None, Prerelease.BETA, 0, None), "1.0.0-beta.1"),
+    (("1.0.0-beta.1", None, Prerelease.RC, 0, None), "1.0.0-rc.0"),
+    (("1.0.0-rc.0", None, Prerelease.RC, 0, None), "1.0.0-rc.1"),
+    (("1.0.0-rc.0", None, Prerelease.RC, 0, 1), "1.0.0-rc.1.dev.1"),
+    (("1.0.0-rc.0", SemVerIncrement.PATCH, None, 0, None), "1.0.0"),
+    (("1.0.0-alpha.3.dev.0", None, Prerelease.BETA, 0, None), "1.0.0-beta.0"),
+    (("1.0.0", SemVerIncrement.PATCH, None, 0, None), "1.0.1"),
+    (("1.0.1", SemVerIncrement.PATCH, None, 0, None), "1.0.2"),
+    (("1.0.2", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1.1.0", SemVerIncrement.MINOR, None, 0, None), "1.2.0"),
+    (("1.2.0", SemVerIncrement.PATCH, None, 0, None), "1.2.1"),
+    (("1.2.1", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
 ]
 
 local_versions = [
-    (("4.5.0+0.1.0", "PATCH", None, 0, None), "4.5.0+0.1.1"),
-    (("4.5.0+0.1.1", "MINOR", None, 0, None), "4.5.0+0.2.0"),
-    (("4.5.0+0.2.0", "MAJOR", None, 0, None), "4.5.0+1.0.0"),
+    (("4.5.0+0.1.0", SemVerIncrement.PATCH, None, 0, None), "4.5.0+0.1.1"),
+    (("4.5.0+0.1.1", SemVerIncrement.MINOR, None, 0, None), "4.5.0+0.2.0"),
+    (("4.5.0+0.2.0", SemVerIncrement.MAJOR, None, 0, None), "4.5.0+1.0.0"),
 ]
 
 # never bump backwards on pre-releases
 linear_prerelease_cases = [
-    (("0.1.1-beta.1", None, "alpha", 0, None), "0.1.1-beta.2"),
-    (("0.1.1-rc.0", None, "alpha", 0, None), "0.1.1-rc.1"),
-    (("0.1.1-rc.0", None, "beta", 0, None), "0.1.1-rc.1"),
+    (("0.1.1-beta.1", None, Prerelease.ALPHA, 0, None), "0.1.1-beta.2"),
+    (("0.1.1-rc.0", None, Prerelease.ALPHA, 0, None), "0.1.1-rc.1"),
+    (("0.1.1-rc.0", None, Prerelease.BETA, 0, None), "0.1.1-rc.1"),
 ]
 
 weird_cases = [
-    (("1.1", "PATCH", None, 0, None), "1.1.1"),
-    (("1", "MINOR", None, 0, None), "1.1.0"),
-    (("1", "MAJOR", None, 0, None), "2.0.0"),
-    (("1-alpha.0", None, "alpha", 0, None), "1.0.0-alpha.1"),
-    (("1-alpha.0", None, "alpha", 1, None), "1.0.0-alpha.1"),
-    (("1", None, "beta", 0, None), "1.0.0-beta.0"),
-    (("1", None, "beta", 1, None), "1.0.0-beta.1"),
-    (("1-beta", None, "beta", 0, None), "1.0.0-beta.1"),
-    (("1.0.0-alpha.1", None, "alpha", 0, None), "1.0.0-alpha.2"),
-    (("1", None, "rc", 0, None), "1.0.0-rc.0"),
-    (("1.0.0-rc.1+e20d7b57f3eb", "PATCH", None, 0, None), "1.0.0"),
+    (("1.1", SemVerIncrement.PATCH, None, 0, None), "1.1.1"),
+    (("1", SemVerIncrement.MINOR, None, 0, None), "1.1.0"),
+    (("1", SemVerIncrement.MAJOR, None, 0, None), "2.0.0"),
+    (("1-alpha.0", None, Prerelease.ALPHA, 0, None), "1.0.0-alpha.1"),
+    (("1-alpha.0", None, Prerelease.ALPHA, 1, None), "1.0.0-alpha.1"),
+    (("1", None, Prerelease.BETA, 0, None), "1.0.0-beta.0"),
+    (("1", None, Prerelease.BETA, 1, None), "1.0.0-beta.1"),
+    (("1-beta", None, Prerelease.BETA, 0, None), "1.0.0-beta.1"),
+    (("1.0.0-alpha.1", None, Prerelease.ALPHA, 0, None), "1.0.0-alpha.2"),
+    (("1", None, Prerelease.RC, 0, None), "1.0.0-rc.0"),
+    (("1.0.0-rc.1+e20d7b57f3eb", SemVerIncrement.PATCH, None, 0, None), "1.0.0"),
 ]
 
 # test driven development
 tdd_cases = [
-    (("0.1.1", "PATCH", None, 0, None), "0.1.2"),
-    (("0.1.1", "MINOR", None, 0, None), "0.2.0"),
-    (("2.1.1", "MAJOR", None, 0, None), "3.0.0"),
-    (("0.9.0", "PATCH", "alpha", 0, None), "0.9.1-alpha.0"),
-    (("0.9.0", "MINOR", "alpha", 0, None), "0.10.0-alpha.0"),
-    (("0.9.0", "MAJOR", "alpha", 0, None), "1.0.0-alpha.0"),
-    (("0.9.0", "MAJOR", "alpha", 1, None), "1.0.0-alpha.1"),
-    (("1.0.0-alpha.2", None, "beta", 0, None), "1.0.0-beta.0"),
-    (("1.0.0-alpha.2", None, "beta", 1, None), "1.0.0-beta.1"),
-    (("1.0.0-beta.1", None, "rc", 0, None), "1.0.0-rc.0"),
-    (("1.0.0-rc.1", None, "rc", 0, None), "1.0.0-rc.2"),
-    (("1.0.0-alpha.0", None, "rc", 0, None), "1.0.0-rc.0"),
-    (("1.0.0-alpha.1", None, "alpha", 0, None), "1.0.0-alpha.2"),
+    (("0.1.1", SemVerIncrement.PATCH, None, 0, None), "0.1.2"),
+    (("0.1.1", SemVerIncrement.MINOR, None, 0, None), "0.2.0"),
+    (("2.1.1", SemVerIncrement.MAJOR, None, 0, None), "3.0.0"),
+    (("0.9.0", SemVerIncrement.PATCH, Prerelease.ALPHA, 0, None), "0.9.1-alpha.0"),
+    (("0.9.0", SemVerIncrement.MINOR, Prerelease.ALPHA, 0, None), "0.10.0-alpha.0"),
+    (("0.9.0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 0, None), "1.0.0-alpha.0"),
+    (("0.9.0", SemVerIncrement.MAJOR, Prerelease.ALPHA, 1, None), "1.0.0-alpha.1"),
+    (("1.0.0-alpha.2", None, Prerelease.BETA, 0, None), "1.0.0-beta.0"),
+    (("1.0.0-alpha.2", None, Prerelease.BETA, 1, None), "1.0.0-beta.1"),
+    (("1.0.0-beta.1", None, Prerelease.RC, 0, None), "1.0.0-rc.0"),
+    (("1.0.0-rc.1", None, Prerelease.RC, 0, None), "1.0.0-rc.2"),
+    (("1.0.0-alpha.0", None, Prerelease.RC, 0, None), "1.0.0-rc.0"),
+    (("1.0.0-alpha.1", None, Prerelease.ALPHA, 0, None), "1.0.0-alpha.2"),
 ]
 
 
diff --git a/tests/test_version_schemes.py b/tests/test_version_schemes.py
index 8e2dae9027..ef646d6d2c 100644
--- a/tests/test_version_schemes.py
+++ b/tests/test_version_schemes.py
@@ -12,7 +12,35 @@
 
 from commitizen.config.base_config import BaseConfig
 from commitizen.exceptions import VersionSchemeUnknown
-from commitizen.version_schemes import Pep440, SemVer, get_version_scheme
+from commitizen.version_schemes import Pep440, Prerelease, SemVer, get_version_scheme
+
+
+class TestPrereleaseSafeCast:
+    def test_safe_cast_valid_strings(self):
+        assert Prerelease.safe_cast("ALPHA") == Prerelease.ALPHA
+        assert Prerelease.safe_cast("BETA") == Prerelease.BETA
+        assert Prerelease.safe_cast("RC") == Prerelease.RC
+
+    def test_safe_cast_case_insensitive(self):
+        assert Prerelease.safe_cast("alpha") == Prerelease.ALPHA
+        assert Prerelease.safe_cast("beta") == Prerelease.BETA
+        assert Prerelease.safe_cast("rc") == Prerelease.RC
+        assert Prerelease.safe_cast("Alpha") == Prerelease.ALPHA
+        assert Prerelease.safe_cast("Beta") == Prerelease.BETA
+        assert Prerelease.safe_cast("Rc") == Prerelease.RC
+
+    def test_safe_cast_invalid_strings(self):
+        assert Prerelease.safe_cast("invalid") is None
+        assert Prerelease.safe_cast("") is None
+        assert Prerelease.safe_cast("release") is None
+
+    def test_safe_cast_non_string_values(self):
+        assert Prerelease.safe_cast(None) is None
+        assert Prerelease.safe_cast(1) is None
+        assert Prerelease.safe_cast(True) is None
+        assert Prerelease.safe_cast([]) is None
+        assert Prerelease.safe_cast({}) is None
+        assert Prerelease.safe_cast(Prerelease.ALPHA) is None  # enum value itself
 
 
 def test_default_version_scheme_is_pep440(config: BaseConfig):