diff --git a/package.json b/package.json
index 3db0a20..88fcb46 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "Client-side Bitcoin JavaScript library",
   "main": "./src/index.js",
   "engines": {
-    "node": ">=0.12"
+    "node": ">=4.0.0"
   },
   "keywords": [
     "bitcoin",