diff --git a/package.json b/package.json
index 8ad5aac..174f020 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "hdkey",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "Bitcoin BIP32 hierarchical deterministic keys",
   "main": "lib/hdkey.js",
   "repository": {