diff --git a/Gitea-tips-and-tricks-for-TAs.md b/Gitea-tips-and-tricks-for-TAs.md
index afa5059..774bc67 100644
--- a/Gitea-tips-and-tricks-for-TAs.md
+++ b/Gitea-tips-and-tricks-for-TAs.md
@@ -10,8 +10,8 @@ on: [push]
 
 jobs:
   run:
+    runs-on: focs-ubuntu-latest-slim
     container:
-      image: focs.ji.sjtu.edu.cn:5000/gitea/runner-images:focs-ubuntu-latest-slim
       volumes:
         - /home/tt/.config:/home/tt/.config
         - /home/tt/.cache:/home/tt/.cache