diff --git a/aws_lambda_powertools/utilities/data_masking/base.py b/aws_lambda_powertools/utilities/data_masking/base.py
index 1541e6f761b..0c58ee2a861 100644
--- a/aws_lambda_powertools/utilities/data_masking/base.py
+++ b/aws_lambda_powertools/utilities/data_masking/base.py
@@ -11,7 +11,7 @@
 import logging
 import warnings
 from copy import deepcopy
-from typing import TYPE_CHECKING, Any, Callable, Mapping, Sequence
+from typing import TYPE_CHECKING, Any
 
 from jsonpath_ng.ext import parse
 
@@ -23,6 +23,7 @@
 from aws_lambda_powertools.warnings import PowertoolsUserWarning
 
 if TYPE_CHECKING:
+    from collections.abc import Callable, Mapping, Sequence
     from numbers import Number
 
 logger = logging.getLogger(__name__)
diff --git a/aws_lambda_powertools/utilities/data_masking/provider/base.py b/aws_lambda_powertools/utilities/data_masking/provider/base.py
index 16fa22d16b8..e8724c5a4de 100644
--- a/aws_lambda_powertools/utilities/data_masking/provider/base.py
+++ b/aws_lambda_powertools/utilities/data_masking/provider/base.py
@@ -3,13 +3,18 @@
 import functools
 import json
 import re
-from typing import Any, Callable
+from typing import TYPE_CHECKING, Any
 
 from aws_lambda_powertools.utilities.data_masking.constants import DATA_MASKING_STRING
 
+if TYPE_CHECKING:
+    from collections.abc import Callable
+
 PRESERVE_CHARS = set("-_. ")
 _regex_cache = {}
 
+JSON_DUMPS_CALL = functools.partial(json.dumps, ensure_ascii=False)
+
 
 class BaseProvider:
     """
@@ -49,7 +54,7 @@ def lambda_handler(event, context):
 
     def __init__(
         self,
-        json_serializer: Callable[..., str] = functools.partial(json.dumps, ensure_ascii=False),
+        json_serializer: Callable[..., str] = JSON_DUMPS_CALL,
         json_deserializer: Callable[[str], Any] = json.loads,
     ) -> None:
         self.json_serializer = json_serializer
diff --git a/aws_lambda_powertools/utilities/data_masking/provider/kms/aws_encryption_sdk.py b/aws_lambda_powertools/utilities/data_masking/provider/kms/aws_encryption_sdk.py
index 07d48efe569..c9c902d51cc 100644
--- a/aws_lambda_powertools/utilities/data_masking/provider/kms/aws_encryption_sdk.py
+++ b/aws_lambda_powertools/utilities/data_masking/provider/kms/aws_encryption_sdk.py
@@ -4,7 +4,7 @@
 import json
 import logging
 from binascii import Error
-from typing import Any, Callable
+from typing import TYPE_CHECKING, Any
 
 import botocore
 from aws_encryption_sdk import (
@@ -41,8 +41,13 @@
 )
 from aws_lambda_powertools.utilities.data_masking.provider import BaseProvider
 
+if TYPE_CHECKING:
+    from collections.abc import Callable
+
 logger = logging.getLogger(__name__)
 
+JSON_DUMPS_CALL = functools.partial(json.dumps, ensure_ascii=False)
+
 
 class AWSEncryptionSDKProvider(BaseProvider):
     """
@@ -81,7 +86,7 @@ def __init__(
         max_cache_age_seconds: float = MAX_CACHE_AGE_SECONDS,
         max_messages_encrypted: int = MAX_MESSAGES_ENCRYPTED,
         max_bytes_encrypted: int = MAX_BYTES_ENCRYPTED,
-        json_serializer: Callable[..., str] = functools.partial(json.dumps, ensure_ascii=False),
+        json_serializer: Callable[..., str] = JSON_DUMPS_CALL,
         json_deserializer: Callable[[str], Any] = json.loads,
     ):
         super().__init__(json_serializer=json_serializer, json_deserializer=json_deserializer)
diff --git a/tests/functional/data_masking/_aws_encryption_sdk/test_aws_encryption_sdk.py b/tests/functional/data_masking/_aws_encryption_sdk/test_aws_encryption_sdk.py
index 63aca871e44..039e302bf93 100644
--- a/tests/functional/data_masking/_aws_encryption_sdk/test_aws_encryption_sdk.py
+++ b/tests/functional/data_masking/_aws_encryption_sdk/test_aws_encryption_sdk.py
@@ -1,7 +1,9 @@
+from __future__ import annotations
+
 import base64
 import functools
 import json
-from typing import Any, Callable, Union
+from typing import TYPE_CHECKING, Any
 
 import pytest
 from aws_encryption_sdk.identifiers import Algorithm
@@ -13,16 +15,21 @@
     AWSEncryptionSDKProvider,
 )
 
+if TYPE_CHECKING:
+    from collections.abc import Callable
+
+JSON_DUMPS_CALL = functools.partial(json.dumps, ensure_ascii=False)
+
 
 class FakeEncryptionKeyProvider(BaseProvider):
     def __init__(
         self,
-        json_serializer: Callable = functools.partial(json.dumps, ensure_ascii=False),
+        json_serializer: Callable = JSON_DUMPS_CALL,
         json_deserializer: Callable = json.loads,
     ) -> None:
         super().__init__(json_serializer, json_deserializer)
 
-    def encrypt(self, data: Union[bytes, str], **kwargs) -> str:
+    def encrypt(self, data: bytes | str, **kwargs) -> str:
         encoded_data: str = self.json_serializer(data)
         ciphertext = base64.b64encode(encoded_data.encode("utf-8")).decode()
         return ciphertext
diff --git a/tests/functional/data_masking/_pydantic/test_data_masking_with_pydantic.py b/tests/functional/data_masking/_pydantic/test_data_masking_with_pydantic.py
index b2bc94ed2ef..40ccf5280f8 100644
--- a/tests/functional/data_masking/_pydantic/test_data_masking_with_pydantic.py
+++ b/tests/functional/data_masking/_pydantic/test_data_masking_with_pydantic.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import dataclasses
 
 import pytest
diff --git a/tests/functional/data_masking/conftest.py b/tests/functional/data_masking/conftest.py
index f73ccca4113..15ce865abfa 100644
--- a/tests/functional/data_masking/conftest.py
+++ b/tests/functional/data_masking/conftest.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pytest_socket import disable_socket
 
 
diff --git a/tests/functional/data_masking/required_dependencies/test_erase_data_masking.py b/tests/functional/data_masking/required_dependencies/test_erase_data_masking.py
index 12ffd054376..6aac48927da 100644
--- a/tests/functional/data_masking/required_dependencies/test_erase_data_masking.py
+++ b/tests/functional/data_masking/required_dependencies/test_erase_data_masking.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import json
 
 import pytest
diff --git a/tests/unit/data_masking/_aws_encryption_sdk/test_kms_provider.py b/tests/unit/data_masking/_aws_encryption_sdk/test_kms_provider.py
index 5fe9b2e53ed..d736fafe6b6 100644
--- a/tests/unit/data_masking/_aws_encryption_sdk/test_kms_provider.py
+++ b/tests/unit/data_masking/_aws_encryption_sdk/test_kms_provider.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from aws_lambda_powertools.utilities.data_masking.exceptions import (
diff --git a/tests/unit/data_masking/required_dependencies/test_base_functions.py b/tests/unit/data_masking/required_dependencies/test_base_functions.py
index 1af532967c7..9ce3de65cfb 100644
--- a/tests/unit/data_masking/required_dependencies/test_base_functions.py
+++ b/tests/unit/data_masking/required_dependencies/test_base_functions.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from aws_lambda_powertools.utilities.data_masking.base import DataMasking