diff --git a/package.json b/package.json
index c97d219..158d927 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "release": "Clean, build, test, publish docs, and prepare release (a one-step publish process)"
   },
   "engines": {
-    "node": ">=4"
+    "node": ">=4.5"
   },
   "devDependencies": {
     "@types/node": "^8.0.4",