diff --git a/Source/Modules/AppDelegate.swift b/Source/Modules/AppDelegate.swift
index bda7d169..e0e96849 100644
--- a/Source/Modules/AppDelegate.swift
+++ b/Source/Modules/AppDelegate.swift
@@ -20,6 +20,19 @@ public class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCen
   private var folderMonitor = FolderMonitor(
     url: URL(fileURLWithPath: LMMgr.dataFolderPath(isDefaultFolder: false))
   )
+
+  public static var updateInfoSourceURL: URL? {
+    guard let urlText = Bundle.main.infoDictionary?["UpdateInfoEndpoint"] as? String else {
+      NSLog("vChewingDebug: Fatal error: Info.plist wrecked. It needs to have correct 'UpdateInfoEndpoint' value.")
+      return nil
+    }
+    return .init(string: urlText)
+  }
+
+  public func checkUpdate(forced: Bool) {
+    guard let url = Self.updateInfoSourceURL else { return }
+    UpdateSputnik.shared.checkForUpdate(forced: forced, url: url)
+  }
 }
 
 // MARK: - Private Functions
@@ -80,7 +93,7 @@ public extension AppDelegate {
 
     // 只要使用者沒有勾選檢查更新、沒有主動做出要檢查更新的操作，就不要檢查更新。
     if PrefMgr.shared.checkUpdateAutomatically {
-      UpdateSputnik.shared.checkForUpdate(forced: false, url: kUpdateInfoSourceURL)
+      checkUpdate(forced: false)
     }
   }
 
diff --git a/Source/Modules/SessionCtl_Core.swift b/Source/Modules/SessionCtl_Core.swift
index 4532137c..81f82546 100644
--- a/Source/Modules/SessionCtl_Core.swift
+++ b/Source/Modules/SessionCtl_Core.swift
@@ -318,7 +318,7 @@ public extension SessionCtl {
       }
 
       DispatchQueue.main.async {
-        UpdateSputnik.shared.checkForUpdate(forced: false, url: kUpdateInfoSourceURL)
+        AppDelegate.shared.checkUpdate(forced: false)
         AppDelegate.shared.checkMemoryUsage()
       }
 
diff --git a/Source/Modules/SessionCtl_Menu.swift b/Source/Modules/SessionCtl_Menu.swift
index 4935a819..ef42c31d 100644
--- a/Source/Modules/SessionCtl_Menu.swift
+++ b/Source/Modules/SessionCtl_Menu.swift
@@ -373,7 +373,7 @@ public extension SessionCtl {
   }
 
   @objc func checkForUpdate(_: Any? = nil) {
-    UpdateSputnik.shared.checkForUpdate(forced: true, url: kUpdateInfoSourceURL)
+    AppDelegate.shared.checkUpdate(forced: true)
   }
 
   @objc func openUserDataFolder(_: Any? = nil) {
diff --git a/Source/Modules/main.swift b/Source/Modules/main.swift
index 3d8f446c..57cd7b60 100644
--- a/Source/Modules/main.swift
+++ b/Source/Modules/main.swift
@@ -57,16 +57,7 @@ else {
   exit(-1)
 }
 
-guard let mainBundleInfoDict = Bundle.main.infoDictionary,
-      let strUpdateInfoSource = mainBundleInfoDict["UpdateInfoEndpoint"] as? String,
-      let urlUpdateInfoSource = URL(string: strUpdateInfoSource)
-else {
-  NSLog("vChewingDebug: Fatal error: Info.plist wrecked. It needs to have correct 'UpdateInfoEndpoint' value.")
-  exit(-1)
-}
-
 public let theServer = server
-public let kUpdateInfoSourceURL = urlUpdateInfoSource
 
 NSApplication.shared.delegate = AppDelegate.shared
 _ = NSApplicationMain(CommandLine.argc, CommandLine.unsafeArgv)