diff --git a/Makefile b/Makefile
index dbabbdb..ad9c35d 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ prepare:
 	cp JOJ3/build/joj3 bin/
 
 force-build: prepare
-	docker build --no-cache -t focs.ji.sjtu.educn:5000/gitea/runner-images:focs-ubuntu-latest-slim .
+	docker build --no-cache -t focs.ji.sjtu.edu.cn:5000/gitea/runner-images:focs-ubuntu-latest-slim .
 
 build: prepare
 	docker build -t focs.ji.sjtu.edu.cn:5000/gitea/runner-images:focs-ubuntu-latest-slim .