diff --git a/.travis.yml b/.travis.yml
index 99f6789..5956e65 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,10 @@
 language: node_js
 node_js:
-  - "4"
+  - "6"
+
+cache:
+  directories:
+    - node_modules
 
 branches:
   only: