diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e684961..3f55152 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -146,7 +146,7 @@ jobs:
       - name: Calculate cache id
         run: echo "cache_id=$(date --utc '+%V')" >> "$GITHUB_ENV"
       - name: Cache lychee
-        uses: actions/cache@v4
+        uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5
         with:
           key: lychee-${{ env.cache_id }}
           path: .lycheecache