diff --git a/.github/workflows/deploy_book.yml b/.github/workflows/deploy_book.yml
index 0660047e..4068ec43 100644
--- a/.github/workflows/deploy_book.yml
+++ b/.github/workflows/deploy_book.yml
@@ -20,8 +20,7 @@ jobs:
         with:
           mdbook-version: 'latest'
 
-      - run: ls
-      - run: mdbook build
+      - run: cd book && mdbook build
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3