diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
index 6d1f852..4cdc89b 100644
--- a/.github/workflows/backend.yml
+++ b/.github/workflows/backend.yml
@@ -31,7 +31,7 @@ jobs:
           ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Setup php extensions cache
         id: extcache