diff --git a/FirebaseAuth.podspec b/FirebaseAuth.podspec
index b4c3331124b..87a89205d75 100644
--- a/FirebaseAuth.podspec
+++ b/FirebaseAuth.podspec
@@ -53,6 +53,7 @@ supports email and password accounts, as well as several 3rd party authenticatio
   s.dependency 'GoogleUtilities/AppDelegateSwizzler', '~> 7.4'
   s.dependency 'GoogleUtilities/Environment', '~> 7.4'
   s.dependency 'GTMSessionFetcher/Core', '~> 1.5'
+  s.dependency 'GoogleMulticastAppDelegate', '~> 7.5'
 
   s.test_spec 'unit' do |unit_tests|
     unit_tests.scheme = { :code_coverage => true }
diff --git a/FirebaseAuth/Sources/Auth/FIRAuth.m b/FirebaseAuth/Sources/Auth/FIRAuth.m
index f11fe1ce537..ef38f8e1df7 100644
--- a/FirebaseAuth/Sources/Auth/FIRAuth.m
+++ b/FirebaseAuth/Sources/Auth/FIRAuth.m
@@ -77,7 +77,14 @@
 #import "FirebaseAuth/Sources/SystemService/FIRAuthAppCredentialManager.h"
 #import "FirebaseAuth/Sources/SystemService/FIRAuthNotificationManager.h"
 #import "FirebaseAuth/Sources/Utilities/FIRAuthURLPresenter.h"
-#endif
+
+#if SWIFT_PACKAGE
+@import GoogleUtilities_MulticastAppDelegate;
+#else // SWIFT_PACKAGE
+#import <GoogleMulticastAppDelegate/GoogleMulticastAppDelegate-Swift.h>
+#endif // SWIFT_PACKAGE
+
+#endif // TARGET_OS_IOS
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -482,7 +489,14 @@ - (nullable instancetype)initWithAPIKey:(NSString *)APIKey appName:(NSString *)a
     }
     UIApplication *application = [applicationClass sharedApplication];
 
-    [GULAppDelegateSwizzler proxyOriginalDelegateIncludingAPNSMethods];
+    // Use Multicast App Delegate when available but fallback to App Delegate Swizzler for backward compatibility.
+    id<GULMulticastAppDelegateProtocol> multicastDelegate =
+        [GULMulticastAppDelegate installedMulticastDelegate];
+    if (multicastDelegate == nil) {
+      FIRLogInfo(kFIRLoggerAuth, @"I-AUT000018", @"Multicast App delegate was not detected. Make sure app events forwarding is configured manually for you app. <Add link to docs>");
+      [GULAppDelegateSwizzler proxyOriginalDelegateIncludingAPNSMethods];
+    }
+
     [GULSceneDelegateSwizzler proxyOriginalSceneDelegate];
 #endif  // TARGET_OS_IOS
 
@@ -540,7 +554,11 @@ - (nullable instancetype)initWithAPIKey:(NSString *)APIKey appName:(NSString *)a
            initWithApplication:application
           appCredentialManager:strongSelf->_appCredentialManager];
 
-      [GULAppDelegateSwizzler registerAppDelegateInterceptor:strongSelf];
+      if (multicastDelegate != nil) {
+        [multicastDelegate addInterceptor:strongSelf];
+      } else {
+        [GULAppDelegateSwizzler registerAppDelegateInterceptor:strongSelf];
+      }
 #if ((TARGET_OS_IOS || TARGET_OS_TV) && (__IPHONE_OS_VERSION_MAX_ALLOWED >= 130000))
       if (@available(iOS 13, tvos 13, *)) {
         [GULSceneDelegateSwizzler registerSceneDelegateInterceptor:strongSelf];
diff --git a/Package.swift b/Package.swift
index 665bc6ffd09..9f9c9170eb0 100644
--- a/Package.swift
+++ b/Package.swift
@@ -153,7 +153,7 @@ let package = Package(
     .package(
       name: "GoogleUtilities",
       url: "https://github.com/google/GoogleUtilities.git",
-      "7.4.0" ..< "8.0.0"
+      .branch("mm/app-delegate-sample")
     ),
     .package(
       name: "GTMSessionFetcher",
@@ -372,6 +372,7 @@ let package = Package(
       dependencies: [
         "FirebaseCore",
         .product(name: "GULAppDelegateSwizzler", package: "GoogleUtilities"),
+        .product(name: "GULMulticastAppDelegate", package: "GoogleUtilities"),
         .product(name: "GULEnvironment", package: "GoogleUtilities"),
         .product(name: "GTMSessionFetcherCore", package: "GTMSessionFetcher"),
       ],