diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 41dd32f..ed2d0f9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     name: Lean Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: leanprover/lean-action@v1
         with:
           build-args: "--wfail"