diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 70d92ca..c735d9c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -52,7 +52,7 @@ jobs:
           npx -y pagefind --site public
 
       - name: Restore lychee cache
-        uses: actions/cache@v4
+        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4
         with:
             path: .lycheecache
             key: cache-lychee-${{ github.sha }}