diff --git a/.travis.yml b/.travis.yml
index 88d7a5a..bf99bd7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,9 +5,6 @@ node_js:
   - "6"
   - "5"
   - "4"
-  - "0.12"
-  - "0.10"
-  - "iojs"
 after_success:
   - npm install coveralls mocha-lcov-reporter
   - npm run coveralls
diff --git a/package.json b/package.json
index 2df0592..0f7ad66 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,9 @@
   "author": "William Belle <william.belle@gmail.com>",
   "license": "Apache-2.0",
   "repository": "https://github.com/healthonnet/honcode-certification-utils.git",
+  "engines": {
+    "node": ">=4"
+  },
   "main": "src/index.js",
   "files": [
     "src/index.js"