diff --git a/package.json b/package.json
index ae44db7..6b2f8b4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "zeromq",
-    "version": "0.3.1",
+    "version": "0.4.0",
     "description": "Bindings for node.js to zeromq",
     "main": "zeromq",
     "repository": {