diff --git a/.github/workflows/build_book.yaml b/.github/workflows/build_book.yaml
index 6853785..d3957ca 100644
--- a/.github/workflows/build_book.yaml
+++ b/.github/workflows/build_book.yaml
@@ -72,7 +72,7 @@ jobs:
         uses: nwtgck/actions-netlify@v1.1
         with:
           publish-dir: './_book'
-          production-branch: master
+          production-branch: main
           github-token: ${{ secrets.GITHUB_TOKEN }}
           deploy-message:
             'Deploy from GHA: ${{ github.event.pull_request.title || github.event.head_commit.message }} (${{ github.sha }})'