diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 1e7132b..5aa2f46 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -38,6 +38,7 @@ jobs:
           make html
 
       - name: Deploy to GitHub Pages
+        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}