diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9896c88..e27bcfd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,44 @@ All notable changes to CC Switch 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).
 
+## [3.1.1] - 2025-09-03
+
+### 🐛 Bug Fixes
+- Fixed the default codex config.toml to match the latest modifications
+- Improved provider configuration UX with custom option
+
+### 📝 Documentation
+- Updated README with latest information
+
+## [3.1.0] - 2025-09-01
+
+### ✨ New Features
+- **Added Codex application support** - Now supports both Claude Code and Codex configuration management
+  - Manage auth.json and config.toml for Codex
+  - Support for backup and restore operations
+  - Preset providers for Codex (Official, PackyCode)
+  - API Key auto-write to auth.json when using presets
+- **New UI components**
+  - App switcher with segmented control design
+  - Dual editor form for Codex configuration
+  - Pills-style app switcher with consistent button widths
+- **Enhanced configuration management**
+  - Multi-app config v2 structure (claude/codex)
+  - Automatic v1→v2 migration with backup
+  - OPENAI_API_KEY validation for non-official presets
+  - TOML syntax validation for config.toml
+
+### 🔧 Technical Improvements
+- Unified Tauri command API with app_type parameter
+- Backward compatibility for app/appType parameters
+- Added get_config_status/open_config_folder/open_external commands
+- Improved error handling for empty config.toml
+
+### 🐛 Bug Fixes
+- Fixed config path reporting and folder opening for Codex
+- Corrected default import behavior when main config is missing
+- Fixed non_snake_case warnings in commands.rs
+
 ## [3.0.0] - 2025-08-27
 
 ### 🚀 Major Changes
diff --git a/package.json b/package.json
index 37e02eb..44eb421 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "cc-switch",
-  "version": "3.0.0",
-  "description": "Claude Code 供应商切换工具",
+  "version": "3.1.1",
+  "description": "Claude Code & Codex 供应商切换工具",
   "scripts": {
     "dev": "pnpm tauri dev",
     "build": "pnpm tauri build",
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index dcf7bb0..7591881 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "cc-switch"
-version = "3.0.0"
-description = "Claude Code MCP 服务器配置管理工具"
+version = "3.1.1"
+description = "Claude Code & Codex 供应商配置管理工具"
 authors = ["Jason Young"]
 license = "MIT"
 repository = "https://github.com/jasonyoung/cc-switch"
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index 24454ee..d784b49 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "CC Switch",
-  "version": "3.0.0",
+  "version": "3.1.1",
   "identifier": "com.ccswitch.desktop",
   "build": {
     "frontendDist": "../dist",