diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 953248c..253bdf6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v6
       - name: Render and validate generated harness
         run: uv run --with copier --with pytest --with pyyaml -- pytest tests/