diff --git a/package.json b/package.json
index 827aa2c..b07b6b9 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "nvatom",
   "main": "./lib/notational-velocity",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "private": true,
   "contributors": [
     "Seongjae Lee <seongjae@gmail.com>",