diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 42df9d0..edd8d73 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Generate class reference table and build website
         env: