diff --git a/.github/workflows/deploy-pages.yml b/.github/workflows/deploy-pages.yml
index 72b3dea..06aac74 100644
--- a/.github/workflows/deploy-pages.yml
+++ b/.github/workflows/deploy-pages.yml
@@ -37,6 +37,9 @@ jobs:
           GITHUB_PAGES: 'true'
         run: npm run build
 
+      - name: Copy index.html to 404.html for SPA routing
+        run: cp frontend/dist/index.html frontend/dist/404.html
+
       - name: Setup Pages
         uses: actions/configure-pages@v4