diff --git a/action.yml b/action.yml
index 18ded0d..d332661 100644
--- a/action.yml
+++ b/action.yml
@@ -12,7 +12,7 @@ runs:
     shell: bash
   - run: python -m pip freeze --local
     shell: bash
-  - uses: actions/cache@v4
+  - uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
     with:
       path: ~/.cache/pre-commit
       key: pre-commit-3|${{ env.pythonLocation }}|${{ hashFiles('.pre-commit-config.yaml') }}