diff --git a/Dockerfile b/Dockerfile
index 407d1c6..24acf0a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
 # syntax=docker/dockerfile:1
 
-FROM focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
+FROM focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest-slim
 
 RUN apt-get update && \
-    apt-get install -y sudo && \
+    apt-get install -y sudo python3 python3-pip && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* && \
     useradd -u 1000 -ms /bin/bash tt && \