diff --git a/package-lock.json b/package-lock.json
index 886bcd5..dad5138 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "omusubi-js",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index b2891b1..fb35fd4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "omusubi-js",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "",
   "main": "main.js",
   "types": "omusubi.d.ts",