diff --git a/Sources/App/AppDelegate.swift b/Sources/App/AppDelegate.swift
index a5ecf8b..dd4bb5d 100644
--- a/Sources/App/AppDelegate.swift
+++ b/Sources/App/AppDelegate.swift
@@ -5,6 +5,9 @@ import Speech
 /// 应用主控制器，协调 Fn 键（语音输入）和 Control 键（AI 助手）两种模式
 final class AppDelegate: NSObject, NSApplicationDelegate {
 
+    /// 防止 ARC 优化释放（NSApplication.delegate 是 weak）
+    private static var retainedInstance: AppDelegate?
+
     private let keyMonitor = KeyMonitor()
     private let speechRecognizer = SpeechRecognizer()
     private let audioMonitor = AudioLevelMonitor()
@@ -15,6 +18,11 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
     private var isRecording = false
     private var finalTranscription: String = ""
 
+    override init() {
+        super.init()
+        Self.retainedInstance = self
+    }
+
     func applicationDidFinishLaunching(_ notification: Notification) {
         NSApp.setActivationPolicy(.accessory)
         beginPermissionFlow()
diff --git a/Sources/main.swift b/Sources/main.swift
index 624ed16..429ecd0 100644
--- a/Sources/main.swift
+++ b/Sources/main.swift
@@ -5,4 +5,8 @@ let delegate = AppDelegate()
 
 app.setActivationPolicy(.accessory)
 app.delegate = delegate
-app.run()
+
+// NSApplication.delegate 是 weak 引用，必须保持强引用防止 ARC 优化释放
+withExtendedLifetime(delegate) {
+    app.run()
+}
diff --git a/VoiceInput-20260424.dmg b/VoiceInput-20260425.dmg
similarity index 73%
rename from VoiceInput-20260424.dmg
rename to VoiceInput-20260425.dmg
index 7cf9fa4..542844b 100644
Binary files a/VoiceInput-20260424.dmg and b/VoiceInput-20260425.dmg differ