diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index 69bcd46..03f06f2 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -12,7 +12,7 @@ jobs:
       pages: write  # To push to a GitHub Pages site
       id-token: write # To update the deployment status
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Install latest mdbook