diff --git a/.gitea/workflows/books.yml b/.gitea/workflows/books.yml
index 8046016..0fd72ed 100644
--- a/.gitea/workflows/books.yml
+++ b/.gitea/workflows/books.yml
@@ -26,6 +26,7 @@ jobs:
       - run: poetry install --without dev
       - run: poetry run python books.py
       - run: bash -x upload.sh
+        if: ${{ gitea.ref == 'refs/heads/master' }}
     env:
       USERNAME: ${{ secrets.USERNAME }}
       PASSWORD: ${{ secrets.PASSWORD }}