diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 52b765a..b3e2771 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -26,6 +26,7 @@ jobs:
 
       # 安装 Python 依赖并执行你的 build.sh
       - name: Install Python dependencies & Build backend
+        shell: bash
         run: |
           python -m pip install --upgrade pip
           pip install -r backend/requirements.txt