diff --git a/.travis.yml b/.travis.yml
index e755ce4..f51ea73 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,14 @@ branches:
   - master
   - /^greenkeeper-/
 
+cache:
+  directories:
+    - node_modules
+
+before_install:
+  - npm install -g npm
+  - npm --version
+
 notifications:
   email: false
 
diff --git a/package.json b/package.json
index bfc4aea..f10c7c7 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "pretty-bytes": "^4.0.2",
     "readline-sync": "^1.4.5",
     "webpack": "^1.13.3",
-    "webpack-dev-server": "^1.16.2"
+    "webpack-dev-server": "^2.2.1"
   },
   "babel": {
     "presets": [