diff --git a/package-lock.json b/package-lock.json
index b19322e..fbef492 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "ts-union",
-  "version": "2.2.1",
+  "version": "2.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index ca9cc0a..4c11b13 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ts-union",
-  "version": "2.2.1",
+  "version": "2.3.0",
   "description": "ADT (sum type) in typescript inspired by ML language family",
   "repository": "https://github.com/twop/ts-union",
   "license": "MIT",