diff --git a/.github/workflows/deploy_book.yml b/.github/workflows/deploy_book.yml
index 4e2a1dc..67c44c9 100644
--- a/.github/workflows/deploy_book.yml
+++ b/.github/workflows/deploy_book.yml
@@ -23,7 +23,7 @@ jobs:
 
       - name: Update the main gh-page website
         if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
-        uses: peaceiris/actions-gh-pages@v3.6.1
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./book/_build/html