update node version
diff --git a/Dockerfile b/Dockerfile
index 05efda4..b82e81c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@
   apt-get install -y curl && \
   apt-get update && \
   apt-get remove -y nodejs && \
-  curl -sL https://deb.nodesource.com/setup_0.12 | bash - && \
+  curl -sL https://deb.nodesource.com/setup_6.x | bash - && \
   apt-get install -y nodejs
 
 # only package.json