diff --git a/Dockerfile b/Dockerfile
index aeba81d88cb7de4e0eb6d391205b6f5b7bb184e3..e842380fa36bcc0620f36b7635ea2e8b241a91bf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:14.04
+FROM ubuntu:trusty-20190515
 MAINTAINER ttkkomm@gmail.com
 
 EXPOSE 873
\ No newline at end of file