diff --git a/.gitea/workflows/build-tutorial.yml b/.gitea/workflows/build-tutorial.yml
index 80b8073..1a9593a 100644
--- a/.gitea/workflows/build-tutorial.yml
+++ b/.gitea/workflows/build-tutorial.yml
@@ -40,6 +40,8 @@ jobs:
 
       - name: 安装依赖（corepack yarn4，registry 走 npmmirror）
         run: |
+          # 镜像自带的 yarn1 断链（指向未提取的 /opt/yarn-*），清掉让 corepack 接管
+          rm -f "$(dirname "$(command -v node)")/yarn" "$(dirname "$(command -v node)")/yarnpkg"
           corepack enable
           yarn install --immutable