diff --git a/package.json b/package.json
index 5bb85bc..4bafd8d 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "xml",
     "xmlserializer"
   ],
-  "version": "3.0.0",
+  "version": "4.0.0",
   "license": "MIT",
   "dependencies": {
     "xml-name-validator": "^4.0.0"