diff --git a/action.yml b/action.yml
index a5878b7..38cca14 100644
--- a/action.yml
+++ b/action.yml
@@ -21,6 +21,10 @@ inputs:
     description: "Whether install PDM plugins before update"
     required: false
     default: "false"
+  sign-off-commit:
+    description: "Whether commit message contains signed-off-by"
+    required: false
+    default: "false"
 
 runs:
   using: "composite"
@@ -46,7 +50,16 @@ runs:
         fi
 
     - name: "Commit changes"
-      if: steps.detect-changes.outputs.changed == 'true'
+      if: steps.detect-changes.outputs.changed == 'true' && inputs.sign-off-commit == 'true'
+      uses: EndBug/add-and-commit@v9
+      with:
+        commit: --signoff
+        message: ${{ inputs.commit-message }}
+        new_branch: dep/update-pdm-lock
+        push: origin dep/update-pdm-lock --set-upstream --force
+
+    - name: "Commit changes"
+      if: steps.detect-changes.outputs.changed == 'true' && inputs.sign-off-commit == 'false'
       uses: EndBug/add-and-commit@v9
       with:
         message: ${{ inputs.commit-message }}