diff --git a/README.md b/README.md
index 148f1ed..30578e8 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,8 @@ jobs:
 | `git_email`                    | Email address used to configure git (for git operations)                                                                                                                 | `github-actions[bot]@users.noreply.github.com`  |
 | `push`                         | Define if the changes should be pushed to the branch.                                                                                                                    | true                                            |
 | `commit`                       | Define if the changes should be committed to the branch.                                                                                                                 | true                                            |
-| <!--                           | `changelog`                                                                                                                                                              | Create changelog when bumping the version       | true | --> |
+| `commitizen_version`           | Specify the version to be used by commitizen. Eg: `2.21.0`                                                                                                               | latest                                          |
+| `changelog`                    | Create changelog when bumping the version                                                                                                                                | true                                            |
 
 ## Outputs
 
diff --git a/action.yml b/action.yml
index 219a109..a66a623 100644
--- a/action.yml
+++ b/action.yml
@@ -54,3 +54,7 @@ inputs:
     description: 'Email address used to configure git (for git operations)'
     required: false
     default: 'github-actions[bot]@users.noreply.github.com'
+  commitizen_version:
+    description: 'Specify the version to be used by commitizen'
+    required: false
+    default: 'latest'
diff --git a/entrypoint.sh b/entrypoint.sh
index ad45cea..580d80b 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -4,6 +4,9 @@ if [ $INPUT_DRY_RUN ]; then INPUT_DRY_RUN='--dry-run'; else INPUT_DRY_RUN=''; fi
 if [ $INPUT_CHANGELOG ]; then INPUT_CHANGELOG='--changelog'; else INPUT_CHANGELOG=''; fi
 if [ $INPUT_PRERELEASE ]; then INPUT_PRERELEASE="--prerelease $INPUT_PRERELEASE"; else INPUT_PRERELEASE=''; fi
 if [ "$INPUT_COMMIT" == 'false' ]; then INPUT_COMMIT='--files-only'; else INPUT_COMMIT=''; fi
+if [ "$INPUT_COMMITIZEN_VERSION" == 'latest' ]; then INPUT_COMMITIZEN_VERSION="commitizen"; else INPUT_COMMITIZEN_VERSION="commitizen==$INPUT_COMMITIZEN_VERSION"; fi
+
+
 CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
 INPUT_BRANCH=${INPUT_BRANCH:-$CURRENT_BRANCH}
 INPUT_EXTRA_REQUIREMENTS=${INPUT_EXTRA_REQUIREMENTS:-''}
@@ -13,46 +16,44 @@ REPOSITORY=${INPUT_REPOSITORY:-$GITHUB_REPOSITORY}
 set -e
 
 [ -z "${INPUT_GITHUB_TOKEN}" ] && {
-    echo 'Missing input "github_token: ${{ secrets.GITHUB_TOKEN }}".';
-    exit 1;
-};
+  echo 'Missing input "github_token: ${{ secrets.GITHUB_TOKEN }}".'
+  exit 1
+}
 
 echo "Repository: $REPOSITORY"
 echo "Actor: $GITHUB_ACTOR"
 
 echo "Installing requirements..."
-pip install commitizen $INPUT_EXTRA_REQUIREMENTS
+pip install "$INPUT_COMMITIZEN_VERSION" $INPUT_EXTRA_REQUIREMENTS
 echo "Commitizen version:"
 cz version
 
-
 echo "Configuring git user and email..."
 git config --local user.name "$INPUT_GIT_NAME"
 git config --local user.email "$INPUT_GIT_EMAIL"
 echo "Git name: $(git config --get user.name)"
 echo "Git email: $(git config --get user.email)"
 
-
 echo "Running cz: $INPUT_DRY_RUN $INPUT_COMMIT $INPUT_CHANGELOG $INPUT_PRERELEASE"
 
-if [ $INPUT_CHANGELOG_INCREMENT_FILENAME ];
-then
-    cz bump --yes --changelog-to-stdout $INPUT_COMMIT $INPUT_DRY_RUN $INPUT_CHANGELOG $INPUT_PRERELEASE > $INPUT_CHANGELOG_INCREMENT_FILENAME;
+if [ $INPUT_CHANGELOG_INCREMENT_FILENAME ]; then
+  cz bump --yes --changelog-to-stdout $INPUT_COMMIT $INPUT_DRY_RUN $INPUT_CHANGELOG $INPUT_PRERELEASE >$INPUT_CHANGELOG_INCREMENT_FILENAME
 else
-    cz bump --yes $INPUT_DRY_RUN $INPUT_COMMIT $INPUT_CHANGELOG $INPUT_PRERELEASE;
+  cz bump --yes $INPUT_DRY_RUN $INPUT_COMMIT $INPUT_CHANGELOG $INPUT_PRERELEASE
 fi
 
-export REV=`cz version --project`
-echo "REVISION=$REV" >> $GITHUB_ENV
+REV=$(cz version --project)
+export REV
+
+echo "REVISION=$REV" >>$GITHUB_ENV
 
 echo "::set-output name=version::$REV"
 
-if [ "$INPUT_PUSH" == "true" ];
-then
+if [ "$INPUT_PUSH" == "true" ]; then
   echo "Pushing to branch..."
   remote_repo="https://${GITHUB_ACTOR}:${INPUT_GITHUB_TOKEN}@github.com/${REPOSITORY}.git"
   git pull ${remote_repo} ${INPUT_BRANCH}
-  git push "${remote_repo}" HEAD:${INPUT_BRANCH} --follow-tags --tags;
+  git push "${remote_repo}" HEAD:${INPUT_BRANCH} --follow-tags --tags
 else
   echo "Not pushing"
 fi