diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index bacd384..ec6f11e 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -30,6 +30,7 @@ jobs:
         git update-ref -d refs/heads/gh-pages
         rm -rf *
         mv ../book/* .
+        cp ../CNAME .
         git add .
         git commit -m "Deploy $GITHUB_SHA to gh-pages"
         git push --force