diff --git a/Example/GradientLoadingBar/AppDelegate.swift b/Example/GradientLoadingBar/AppDelegate.swift
index 1444a2e..b83a7b2 100644
--- a/Example/GradientLoadingBar/AppDelegate.swift
+++ b/Example/GradientLoadingBar/AppDelegate.swift
@@ -13,7 +13,7 @@ import UIKit
 class AppDelegate: UIResponder, UIApplicationDelegate {
     var window: UIWindow?
 
-    func application(_: UIApplication, didFinishLaunchingWithOptions _: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    private func application(_: UIApplication, didFinishLaunchingWithOptions _: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         // Override point for customization after application launch.
 
         // Customize shared instance of `GradientLoadingBar`
diff --git a/Example/Tests/ViewModel/GradientLoadingBarViewModelTestCase.swift b/Example/Tests/ViewModel/GradientLoadingBarViewModelTestCase.swift
index 481ec12..ce2e39a 100644
--- a/Example/Tests/ViewModel/GradientLoadingBarViewModelTestCase.swift
+++ b/Example/Tests/ViewModel/GradientLoadingBarViewModelTestCase.swift
@@ -83,7 +83,7 @@ class GradientLoadingBarViewModelTestCase: XCTestCase {
         }.add(to: &disposal)
 
         // When
-        notificationCenter.post(name: .UIWindowDidBecomeKey,
+        notificationCenter.post(name: UIWindow.didBecomeKeyNotification,
                                 object: nil)
     }
 
@@ -111,7 +111,7 @@ class GradientLoadingBarViewModelTestCase: XCTestCase {
 
         // When
         for _ in 1 ... 3 {
-            notificationCenter.post(name: .UIWindowDidBecomeKey,
+            notificationCenter.post(name: UIWindow.didBecomeKeyNotification,
                                     object: nil)
         }
 
diff --git a/GradientLoadingBar/Classes/ViewModel/GradientLoadingBarViewModel.swift b/GradientLoadingBar/Classes/ViewModel/GradientLoadingBarViewModel.swift
index ca2e474..1cc882d 100644
--- a/GradientLoadingBar/Classes/ViewModel/GradientLoadingBarViewModel.swift
+++ b/GradientLoadingBar/Classes/ViewModel/GradientLoadingBarViewModel.swift
@@ -61,7 +61,7 @@ class GradientLoadingBarViewModel {
             // Therefore we setup an observer to inform the listeners when it's ready.
             notificationCenter.addObserver(self,
                                            selector: #selector(didReceiveUiWindowDidBecomeKeyNotification(_:)),
-                                           name: .UIWindowDidBecomeKey,
+                                           name: UIWindow.didBecomeKeyNotification,
                                            object: nil)
         }
     }