diff --git a/12/Dockerfile b/12/Dockerfile
index bd954b0..fdbd4b3 100644
--- a/12/Dockerfile
+++ b/12/Dockerfile
@@ -1,4 +1,5 @@
-FROM node:12-alpine3.15
+# FROM node:12-alpine3.15
+FROM node:12.18-alpine
   
 RUN set -eu; \
     sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories; \