diff --git a/.travis.yml b/.travis.yml
index 0b28baff..4bd31892 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,9 @@
 language: node_js
 sudo: false
+node_js:
+  - '0.12'
+  - '4.2'
+  - '5.1'
 addons:
   firefox: latest
   apt:
@@ -9,10 +13,9 @@ addons:
     packages:
       - google-chrome-stable
       - g++-4.8
-node_js:
-  - '0.12'
-  - '4.2'
-  - '5.1'
+cache:
+  directories:
+    - node_modules
 before_script:
   - 'export DISPLAY=:99.0'
   - sh -e /etc/init.d/xvfb start