diff --git a/.travis.yml b/.travis.yml
index 95ed5b9..e2faadb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ node_js:
   - 7
   - 6
   - 5
-  - 4
 notifications:
   email: false
 sudo: false
diff --git a/package.json b/package.json
index 3345053..7536381 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,9 @@
     "import",
     "export"
   ],
+  "engines": {
+    "node": ">=5"
+  },
   "author": {
     "name": "Gajus Kuizinas",
     "email": "gajus@gajus.com",