diff --git a/Assets/UniRealtime/Scripts/package.json b/Assets/UniRealtime/Scripts/package.json
index 0985352..d71801d 100644
--- a/Assets/UniRealtime/Scripts/package.json
+++ b/Assets/UniRealtime/Scripts/package.json
@@ -1,8 +1,8 @@
 {
   "name": "jp.ayutaz.uni-realtime",
   "displayName": "UniRealtime",
-  "version": "0.3.0",
-  "unity": "2023.3",
+  "version": "0.3.1",
+  "unity": "2022.3",
   "description": "OpenAI's realtime api for Unity",
   "keywords": [
     "OpenAI",
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f514ddf..3081c9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.3.1] - 2024-11-19
+
+### Documentation
+- Fixed typos in the ReadMe and package for unity version
+
 ## [0.3.0] - 2024-11-19
 
 ### Added
diff --git a/README.md b/README.md
index 901ba1b..5066f03 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ UniRealtimeは、OpenAIのRealtime APIをUnityプロジェクトに簡単に統
 3. ダウンロードしたUnityパッケージをプロジェクトにインポートします。
 
 # 動作環境
-* Unity: 2021.3.14f1 以降
+* Unity: 2022.3.x 以降
 * OpenAI Realtime API: 最新のAPIバージョンに対応
 
 # サンプルの使用方法
diff --git a/README_EN.md b/README_EN.md
index c1753a4..9e53b9a 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -52,7 +52,7 @@ By running the project, it will operate as shown in the image below.
 3. Import the downloaded Unity package into your project.
 
 # Operating Environment
-* Unity: 2021.3.14f1 or later
+* Unity: 2022.3.x or later
 * OpenAI Realtime API: Compatible with the latest API version
 
 # How to Use the Sample