diff --git a/.github/workflows/book-cd.yml b/.github/workflows/book-cd.yml
index 4151008..bde8a25 100644
--- a/.github/workflows/book-cd.yml
+++ b/.github/workflows/book-cd.yml
@@ -21,7 +21,7 @@ jobs:
         uses: peaceiris/actions-mdbook@v1
       - run: mdbook build docs
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GH_PAT }}
           publish_dir: ./docs/book