diff --git a/.travis.yml b/.travis.yml
index 2dd31bd3b..2afeee148 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,20 +1,26 @@
 sudo: false
 language: node_js
 node_js:
-  - "iojs-v3.2.0"
-  - "0.12"
   - "0.10"
-  - "4.0.0"
+  - "0.12"
+  - "4"
+
+# Node.js 4 is supported but an optional socket.io dependency doesn't work yet, causing
+# a lot of error messages on Travis. Travis then terminates the build because of excessive
+# logging. All tests pass locally on Node.js 4.
+# TODO remove this exception when https://github.com/socketio/socket.io/issues/2228 is fixed.
+matrix:
+  allow_failures:
+    - node_js: "4"
 
 env:
   global:
   - SAUCE_USERNAME: vojtajina
   - secure: "bRVY+hYZwMf1SqVnMyZRJTLD0gN1hLx9/MwO8MM/qBiu3YNjXy49XElfMdzMKN6cZeKTmhcnjmZonbJuI1PQ2t+utGkyjnlVLJ/OlWptreKLzIlcbt4hrdPoTcjmUTwDWq9Ex9cVoYX8AzCasETttpczp3P+s3+vmOUj8z25JyU="
 
-# Make sure we have new NPM.
+# Make sure we have a new npm on Node 0.10.
 before_install:
-  - '[ "${TRAVIS_NODE_VERSION}" != "0.8"  ] || npm install -g npm@1.4.28'
-  - npm install -g npm
+  - '[ "${TRAVIS_NODE_VERSION}" != "0.10" ] || npm install -g npm'
   - npm config set loglevel warn
 
 before_script:
diff --git a/docs/intro/01-installation.md b/docs/intro/01-installation.md
index ad166fe09..e039bdec9 100644
--- a/docs/intro/01-installation.md
+++ b/docs/intro/01-installation.md
@@ -1,11 +1,11 @@
 Karma runs on [Node.js] and is available as an [NPM] package.
 
-## Installing Node.js or iojs
+## Installing Node.js
 
-There are [node.js](http://nodejs.org/download/) or [iojs](https://iojs.org/en/index.html) for both Mac and Windows.
-On Linux, we recommend using [NVM](https://github.com/creationix/nvm).
+On Mac or Linux we recommend using [NVM](https://github.com/creationix/nvm). On Windows, download Node.js
+from [the official site](https://nodejs.org/).
 
-Note: Karma works on the two latest stable versions of node. That is **0.10.x** and **0.12.x** at this point. Also works on iojs 2.x.x.
+Note: Karma currently works on Node.js **0.10**, **0.12.x** and **4.x**. See [FAQ](04-faq.md#which-version-of-nodejs-does-karma-run-with-) for more info.
 
 ## Installing Karma and plugins
 
diff --git a/docs/intro/04-faq.md b/docs/intro/04-faq.md
index 061d9f795..e356c11c2 100644
--- a/docs/intro/04-faq.md
+++ b/docs/intro/04-faq.md
@@ -25,7 +25,7 @@ The latest stable version from NPM (`npm install karma`). See [versioning] for m
 
 
 ### Which version of Node.js does Karma run with ?
-The three latest stable versions. That means `0.8`, `0.10` and `0.12` at this point. Also works on iojs `2.x.x`.
+Karma works on all LTS versions node in active maintenance state (see [LTS docs](https://github.com/nodejs/LTS/blob/master/README.md) for more info) as well as the latest stable version. That is **0.12.x** and **4.x** at this point. Additionally, Node **0.10** is currently supported.
 
 
 [mailing list]: https://groups.google.com/d/forum/karma-users
diff --git a/package.json b/package.json
index 510be173c..7d43436a4 100644
--- a/package.json
+++ b/package.json
@@ -302,7 +302,7 @@
     "karma": "./bin/karma"
   },
   "engines": {
-    "node": ">=0.10 <=0.12 || >=1 <=3"
+    "node": "0.10 || 0.12 || 4"
   },
   "version": "0.13.9",
   "license": "MIT"