diff --git a/.gitea/workflows/php-cs-fixer.yml b/.gitea/workflows/php-cs-fixer.yml
index 584a649..5718ddb 100644
--- a/.gitea/workflows/php-cs-fixer.yml
+++ b/.gitea/workflows/php-cs-fixer.yml
@@ -11,7 +11,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
       - name: Run PHP CS Fixer
-        uses: docker://oskarstark/php-cs-fixer-ga
+        uses: docker://oskarstark/php-cs-fixer-ga@sha256:6b8f643652d9d760b717c0e03d98c2508ccc45af94ec048a820242a21da06019
         with:
           args: --diff --dry-run