diff --git a/.github/workflows/deploy_book.yml b/.github/workflows/deploy_book.yml
index 4ce8133..0c0d7ea 100644
--- a/.github/workflows/deploy_book.yml
+++ b/.github/workflows/deploy_book.yml
@@ -18,8 +18,9 @@ jobs:
         uses: peaceiris/actions-mdbook@v2
         with:
           mdbook-version: '0.4.10'
-
-      - run: mdbook build
+      - run: |
+          cd book
+          mdbook build
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3