diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 12ab8ae..b19798f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,6 +28,6 @@ jobs:
         stack: [heroku-18, heroku-20, heroku-22, heroku-24]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: run stack test
       run: bash test/test-stack.sh ${{ matrix.stack }}