diff --git a/Dockerfile b/Dockerfile
index 8183c7a..f5848e6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:trusty
+FROM ubuntu:wily
 
 RUN apt-get update
 RUN apt-get install -yq ruby ruby-dev build-essential git