diff --git a/.github/workflows/gh_pages.yaml b/.github/workflows/gh_pages.yaml
index 2242885e..811bdc09 100644
--- a/.github/workflows/gh_pages.yaml
+++ b/.github/workflows/gh_pages.yaml
@@ -26,7 +26,7 @@ jobs:
 
       # Deploy to the target directory.
       - name: Deploy to gh pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./book