diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index d3b8ec7..ef6bb6d 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -60,7 +60,7 @@ jobs:
           mdbook build
 
       - name: Deploy to GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./book/book