diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 355110c4..9111e426 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x
-      - uses: actions/cache@v2
+      - uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4
         with:
           key: ${{ github.ref }}
           path: .cache