diff --git a/shadowsocksr/3.3.3/Dockerfile b/shadowsocksr/3.3.3/Dockerfile
index 58d52d9..1ce8cfb 100644
--- a/shadowsocksr/3.3.3/Dockerfile
+++ b/shadowsocksr/3.3.3/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM python:3.7-rc-alpine
 
 MAINTAINER Newnius <newnius.cn@gmail.com>