diff --git a/.github/workflows/github_pages.yml b/.github/workflows/github_pages.yml
index 9d9e3e9..8712e07 100644
--- a/.github/workflows/github_pages.yml
+++ b/.github/workflows/github_pages.yml
@@ -20,6 +20,7 @@ jobs:
           mdbook-version: 'latest'
 
       - run: mdbook build
+        working-directory: ./book
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3