diff --git a/package.json b/package.json
index 864e8748..2676b531 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,7 @@
     "sinon": "^2.1.0"
   },
   "engines": {
-    "node": ">= 4"
+    "node": ">= 6"
   },
   "scripts": {
     "test": "mocha",