diff --git a/package.json b/package.json
index be55f85..4c603dd 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,9 @@
   "version": "2.0.10",
   "description": "Simulates a global browser environment using jsdom",
   "main": "src/index.js",
+  "engines": {
+    "node": ">=4"
+  },
   "scripts": {
     "test": "nyc ava test",
     "lint": "eslint src",