diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 450f2d3..33d0a0d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -74,6 +74,7 @@ jobs:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: _build/html
           publish_branch: gh-pages
+          cname: gpg.geosci.xyz
           force_orphan: true
           user_name: "github-actions[bot]"
           user_email: "github-actions[bot]@users.noreply.github.com"