diff --git a/.travis.yml b/.travis.yml
index 4026a30..c6f653c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,4 +2,4 @@ before_install:
 - npm install babel-cli babel-preset-es2015 mocha
 language: node_js
 node_js:
-  - "0.10"
+  - "4.0"
diff --git a/package.json b/package.json
index cf199d5..33a09ea 100644
--- a/package.json
+++ b/package.json
@@ -42,5 +42,8 @@
     "babel-cli": "^6.6.5",
     "babel-preset-es2015": "^6.6.0",
     "mocha": "^2.4.5"
+  },
+  "engines": {
+    "node": ">= 4"
   }
 }