diff --git a/.github/workflows/validate-notebook-index.yml b/.github/workflows/validate-notebook-index.yml
index 05518f6..01d2e17 100644
--- a/.github/workflows/validate-notebook-index.yml
+++ b/.github/workflows/validate-notebook-index.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Julia
         uses: julia-actions/setup-julia@v1