diff --git a/Dockerfile b/Dockerfile
index 625bda1..715a280 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,3 @@
-# syntax=docker/dockerfile:1
-
 FROM focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest-slim
 
 RUN apt-get update && \