diff --git a/CHANGES.md b/CHANGES.md
index e2f1607..2b27c5d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,6 +11,11 @@
 
 ## develop
 
+## sora-ios-sdk-2022.3.0
+
+- [ADD] 接続失敗時とサーバーによる切断時にエラー内容をアラートで表示する 
+    - @szktty
+
 ## sora-ios-sdk-2022.2.0
 
 - [UPDATE] Environment.example.swift に signalingConnectMetadata を追加する 
diff --git a/Podfile b/Podfile
index b229b02..8962440 100644
--- a/Podfile
+++ b/Podfile
@@ -5,7 +5,7 @@ platform :ios, '13.0'
 
 target 'SoraQuickStart' do
   use_frameworks!
-  pod 'Sora', '2022.2.0'
+  pod 'Sora', '2022.3.0'
 
   pod 'SwiftLint'
   pod 'SwiftFormat/CLI'
diff --git a/README.md b/README.md
index 4bf25d3..842d19e 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,8 @@ Please read https://github.com/shiguredo/oss before use.
 - iOS 13 以降
 - アーキテクチャ arm64, x86_64 (シミュレーターの動作は未保証)
 - macOS 12.2 以降
-- Xcode 13.2
-- Swift 5.5.2
+- Xcode 13.4
+- Swift 5.6.1
 - CocoaPods 1.11.2 以降
 - WebRTC SFU Sora 2021.2 以降
 
diff --git a/SoraQuickStart/ViewController.swift b/SoraQuickStart/ViewController.swift
index f22464f..f5596d6 100644
--- a/SoraQuickStart/ViewController.swift
+++ b/SoraQuickStart/ViewController.swift
@@ -85,6 +85,13 @@ class ViewController: UIViewController {
             }
             if let error = error {
                 NSLog(error.localizedDescription)
+                DispatchQueue.main.async {
+                    let alertController = UIAlertController(title: "接続に失敗しました",
+                                                            message: error.localizedDescription,
+                                                            preferredStyle: .alert)
+                    alertController.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+                    self?.present(alertController, animated: true, completion: nil)
+                }
             }
             strongSelf.updateUI(false)
         }
@@ -96,6 +103,13 @@ class ViewController: UIViewController {
             // 接続に失敗するとエラーが渡されます。
             if let error = error {
                 NSLog(error.localizedDescription)
+                DispatchQueue.main.async { [weak self] in
+                    let alertController = UIAlertController(title: "接続に失敗しました",
+                                                            message: error.localizedDescription,
+                                                            preferredStyle: .alert)
+                    alertController.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
+                    self?.present(alertController, animated: true, completion: nil)
+                }
                 self.updateUI(false)
                 return
             }