diff --git a/Firebase/Auth/Source/Auth/FIRAuth.m b/Firebase/Auth/Source/Auth/FIRAuth.m
index adbb5f8377a..ed9f5b7392e 100644
--- a/Firebase/Auth/Source/Auth/FIRAuth.m
+++ b/Firebase/Auth/Source/Auth/FIRAuth.m
@@ -1136,10 +1136,16 @@ - (void)sendSignInLinkToEmail:(nonnull NSString *)email
           kMissingEmailInvalidParameterExceptionReason];
     }
 
+    /*
+     The sign in can't happen fully in-app, i.e. watchOS does not support universal links but watchOS has a mail client that will open this link appropriately
+     in a browser. From the browser you trigger a cloud function which sends a push notification to complete the sign-in.
+     */
+#if !TARGET_OS_WATCH
     if (!actionCodeSettings.handleCodeInApp) {
       [FIRAuthExceptionUtils raiseInvalidParameterExceptionWithReason:
           kHandleCodeInAppFalseExceptionReason];
     }
+#endif
     FIRGetOOBConfirmationCodeRequest *request =
         [FIRGetOOBConfirmationCodeRequest signInWithEmailLinkRequest:email
                                                   actionCodeSettings:actionCodeSettings
@@ -1820,11 +1826,17 @@ - (BOOL)saveUser:(nullable FIRUser *)user
       success = [_keychainServices removeDataForKey:userKey error:outError];
     } else {
       // Encode the user object.
+#if TARGET_OS_WATCH
+      NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initRequiringSecureCoding:false];
+#else
       NSMutableData *archiveData = [NSMutableData data];
       NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:archiveData];
+#endif
       [archiver encodeObject:user forKey:userKey];
       [archiver finishEncoding];
-
+#if TARGET_OS_WATCH
+      NSData *archiveData = archiver.encodedData;
+#endif
       // Save the user object's encoded value.
       success = [_keychainServices setData:archiveData forKey:userKey error:outError];
     }
@@ -1868,8 +1880,14 @@ - (BOOL)getUser:(FIRUser *_Nullable *)outUser
       *outUser = nil;
       return YES;
     }
+#if TARGET_OS_WATCH
+    NSError *error;
+    NSKeyedUnarchiver *unarchiver =
+        [[NSKeyedUnarchiver alloc] initForReadingFromData:encodedUserData error:&error];
+#else
     NSKeyedUnarchiver *unarchiver =
         [[NSKeyedUnarchiver alloc] initForReadingWithData:encodedUserData];
+#endif
     FIRUser *user = [unarchiver decodeObjectOfClass:[FIRUser class] forKey:userKey];
     user.auth = self;
     *outUser = user;
@@ -2027,8 +2045,14 @@ - (nullable FIRUser *)getStoredUserForAccessGroup:(NSString *_Nullable)accessGro
       return nil;
     }
 
+#if TARGET_OS_WATCH
+    NSError *error;
+    NSKeyedUnarchiver *unarchiver =
+        [[NSKeyedUnarchiver alloc] initForReadingFromData:encodedUserData error:&error];
+#else
     NSKeyedUnarchiver *unarchiver =
         [[NSKeyedUnarchiver alloc] initForReadingWithData:encodedUserData];
+#endif
     user = [unarchiver decodeObjectOfClass:[FIRUser class] forKey:userKey];
   } else {
     user = [self.storedUserManager getStoredUserForAccessGroup:self.userAccessGroup
diff --git a/Firebase/Auth/Source/AuthProvider/GameCenter/FIRGameCenterAuthProvider.m b/Firebase/Auth/Source/AuthProvider/GameCenter/FIRGameCenterAuthProvider.m
index af8e7e6f74d..60b723ca45f 100644
--- a/Firebase/Auth/Source/AuthProvider/GameCenter/FIRGameCenterAuthProvider.m
+++ b/Firebase/Auth/Source/AuthProvider/GameCenter/FIRGameCenterAuthProvider.m
@@ -69,6 +69,9 @@ + (void)getCredentialWithCompletion:(FIRGameCenterCredentialCallback)completion
           `localPlayer.displayname`. For more information, check
           https://developer.apple.com/documentation/gamekit/gkplayer
           **/
+#if TARGET_OS_WATCH
+         completion(nil, [FIRAuthErrorUtils gameCenterNotSupportedError]);
+#else
          NSString *displayName = localPlayer.alias;
          FIRGameCenterAuthCredential *credential =
              [[FIRGameCenterAuthCredential alloc] initWithPlayerID:localPlayer.playerID
@@ -78,6 +81,7 @@ + (void)getCredentialWithCompletion:(FIRGameCenterCredentialCallback)completion
                                                          timestamp:timestamp
                                                        displayName:displayName];
          completion(credential, nil);
+#endif
        }
      }
    }];
diff --git a/Firebase/Auth/Source/AuthProvider/Phone/FIRPhoneAuthProvider.m b/Firebase/Auth/Source/AuthProvider/Phone/FIRPhoneAuthProvider.m
index 5aa66b07c63..c3c4dd09ed5 100644
--- a/Firebase/Auth/Source/AuthProvider/Phone/FIRPhoneAuthProvider.m
+++ b/Firebase/Auth/Source/AuthProvider/Phone/FIRPhoneAuthProvider.m
@@ -15,7 +15,7 @@
  */
 
 #include <TargetConditionals.h>
-#if !TARGET_OS_OSX && !TARGET_OS_TV
+#if !TARGET_OS_OSX && !TARGET_OS_TV && !TARGET_OS_WATCH
 
 #import "FIRPhoneAuthProvider.h"
 
diff --git a/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.h b/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.h
index 5e2acfeb81d..85a49053b09 100644
--- a/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.h
+++ b/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.h
@@ -18,7 +18,12 @@
 #if !TARGET_OS_OSX
 
 #import <Foundation/Foundation.h>
+
+#if TARGET_OS_WATCH
+#import <WatchKit/WatchKit.h>
+#else
 #import <UIKit/UIKit.h>
+#endif
 
 @class FIRAuthAPNSToken;
 
@@ -56,12 +61,21 @@ typedef void (^FIRAuthAPNSTokenCallback)(FIRAuthAPNSToken *_Nullable token,
  */
 - (instancetype)init NS_UNAVAILABLE;
 
+#if TARGET_OS_WATCH
+/** @fn initWithApplication:bundle
+    @brief Initializes the instance.
+    @param application The @c WKExtension  to request the token from.
+    @return The initialized instance.
+ */
+- (instancetype)initWithApplication:(WKExtension *)application NS_DESIGNATED_INITIALIZER;
+#else
 /** @fn initWithApplication:bundle
     @brief Initializes the instance.
     @param application The @c UIApplication to request the token from.
     @return The initialized instance.
  */
 - (instancetype)initWithApplication:(UIApplication *)application NS_DESIGNATED_INITIALIZER;
+#endif
 
 /** @fn getTokenWithCallback:
     @brief Attempts to get the APNs token.
diff --git a/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.m b/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.m
index 1b37363e641..c167724d902 100644
--- a/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.m
+++ b/Firebase/Auth/Source/SystemService/FIRAuthAPNSTokenManager.m
@@ -40,10 +40,19 @@
 static const NSTimeInterval kLegacyRegistrationTimeout = 30;
 
 @implementation FIRAuthAPNSTokenManager {
+  #if TARGET_OS_WATCH
+
+  /** @var _application
+      @brief The @c WKExtension to request the token from.
+  */
+  WKExtension *_application;
+  #else
+
   /** @var _application
       @brief The @c UIApplication to request the token from.
    */
   UIApplication *_application;
+  #endif
 
   /** @var _pendingCallbacks
       @brief The list of all pending callbacks for the APNs token.
@@ -51,7 +60,11 @@ @implementation FIRAuthAPNSTokenManager {
   NSMutableArray<FIRAuthAPNSTokenCallback> *_pendingCallbacks;
 }
 
+#if TARGET_OS_WATCH
+- (instancetype)initWithApplication:(WKExtension *)application {
+#else
 - (instancetype)initWithApplication:(UIApplication *)application {
+#endif
   self = [super init];
   if (self) {
     _application = application;
diff --git a/Firebase/Auth/Source/SystemService/FIRAuthAppCredentialManager.m b/Firebase/Auth/Source/SystemService/FIRAuthAppCredentialManager.m
index 836456ddfdf..59eaa0ff7d8 100644
--- a/Firebase/Auth/Source/SystemService/FIRAuthAppCredentialManager.m
+++ b/Firebase/Auth/Source/SystemService/FIRAuthAppCredentialManager.m
@@ -70,8 +70,13 @@ - (instancetype)initWithKeychain:(FIRAuthKeychainServices *)keychain {
     NSError *error;
     NSData *encodedData = [_keychainServices dataForKey:kKeychainDataKey error:&error];
     if (!error && encodedData) {
+#if TARGET_OS_WATCH
+      NSKeyedUnarchiver *unarchiver =
+          [[NSKeyedUnarchiver alloc] initForReadingFromData:encodedData error:&error];
+#else
       NSKeyedUnarchiver *unarchiver =
           [[NSKeyedUnarchiver alloc] initForReadingWithData:encodedData];
+#endif
       FIRAuthAppCredential *credential =
           [unarchiver decodeObjectOfClass:[FIRAuthAppCredential class]
                                    forKey:kFullCredentialKey];
@@ -137,11 +142,18 @@ - (void)clearCredential {
     @brief Save the data in memory to the keychain ignoring any errors.
  */
 - (void)saveData {
+#if TARGET_OS_WATCH
+  NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initRequiringSecureCoding:false];
+#else
   NSMutableData *archiveData = [NSMutableData data];
   NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:archiveData];
+#endif
   [archiver encodeObject:_credential forKey:kFullCredentialKey];
   [archiver encodeObject:_pendingReceipts forKey:kPendingReceiptsKey];
   [archiver finishEncoding];
+#if TARGET_OS_WATCH
+  NSData *archiveData = archiver.encodedData;
+#endif
   [_keychainServices setData:archiveData forKey:kKeychainDataKey error:NULL];
 }
 
diff --git a/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.h b/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.h
index 3de2e32e8b7..da21deedded 100644
--- a/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.h
+++ b/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.h
@@ -18,7 +18,11 @@
 #if !TARGET_OS_OSX
 
 #import <Foundation/Foundation.h>
+#if TARGET_OS_WATCH
+#import <WatchKit/WatchKit.h>
+#else
 #import <UIKit/UIKit.h>
+#endif
 
 @class FIRAuthAppCredentialManager;
 
@@ -40,6 +44,17 @@ typedef void (^FIRAuthNotificationForwardingCallback)(BOOL isNotificationBeingFo
  */
 @property(nonatomic, assign) NSTimeInterval timeout;
 
+#if TARGET_OS_WATCH
+/** @fn initWithApplication:appCredentialManager:
+    @brief Initializes the instance.
+    @param application The extension.
+    @param appCredentialManager The object to handle app credentials delivered via notification.
+    @return The initialized instance.
+ */
+- (instancetype)initWithApplication:(WKExtension *)application
+               appCredentialManager:(FIRAuthAppCredentialManager *)appCredentialManager
+    NS_DESIGNATED_INITIALIZER;
+#else
 /** @fn initWithApplication:appCredentialManager:
     @brief Initializes the instance.
     @param application The application.
@@ -49,6 +64,7 @@ typedef void (^FIRAuthNotificationForwardingCallback)(BOOL isNotificationBeingFo
 - (instancetype)initWithApplication:(UIApplication *)application
                appCredentialManager:(FIRAuthAppCredentialManager *)appCredentialManager
     NS_DESIGNATED_INITIALIZER;
+#endif
 
 /** @fn init
     @brief please use initWithAppCredentialManager: instead.
diff --git a/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.m b/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.m
index 53488866fb3..dcaa594df49 100644
--- a/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.m
+++ b/Firebase/Auth/Source/SystemService/FIRAuthNotificationManager.m
@@ -52,10 +52,17 @@
 static const NSTimeInterval kProbingTimeout = 1;
 
 @implementation FIRAuthNotificationManager {
+#if TARGET_OS_WATCH
+  /** @var _application
+      @brief The extension.
+   */
+  WKExtension *_application;
+#else
   /** @var _application
       @brief The application.
    */
   UIApplication *_application;
+#endif
 
   /** @var _appCredentialManager
       @brief The object to handle app credentials delivered via notification.
@@ -78,7 +85,11 @@ @implementation FIRAuthNotificationManager {
   NSMutableArray<FIRAuthNotificationForwardingCallback> *_pendingCallbacks;
 }
 
+#if TARGET_OS_WATCH
+- (instancetype)initWithApplication:(WKExtension *)application
+#else
 - (instancetype)initWithApplication:(UIApplication *)application
+#endif
                appCredentialManager:(FIRAuthAppCredentialManager *)appCredentialManager {
   self = [super init];
   if (self) {
@@ -107,12 +118,20 @@ - (void)checkNotificationForwardingWithCallback:(FIRAuthNotificationForwardingCa
         kNotificationProberKey : @"This fake notification should be forwarded to Firebase Auth."
       }
     };
+#if TARGET_OS_WATCH
+    if ([self->_application.delegate respondsToSelector:
+          @selector(didReceiveRemoteNotification:fetchCompletionHandler:)]) {
+      [self->_application.delegate
+          didReceiveRemoteNotification:proberNotification
+                fetchCompletionHandler:^(WKBackgroundFetchResult result) {}];
+#else
     if ([self->_application.delegate respondsToSelector:
             @selector(application:didReceiveRemoteNotification:fetchCompletionHandler:)]) {
       [self->_application.delegate application:self->_application
             didReceiveRemoteNotification:proberNotification
                   fetchCompletionHandler:^(UIBackgroundFetchResult result) {}];
-#if !TARGET_OS_TV
+#endif
+#if !TARGET_OS_TV && !TARGET_OS_WATCH
     } else if ([self->_application.delegate respondsToSelector:
                    @selector(application:didReceiveRemoteNotification:)]) {
       [self->_application.delegate application:self->_application
diff --git a/Firebase/Auth/Source/SystemService/FIRAuthStoredUserManager.m b/Firebase/Auth/Source/SystemService/FIRAuthStoredUserManager.m
index 42f40d6af44..2841306bc08 100644
--- a/Firebase/Auth/Source/SystemService/FIRAuthStoredUserManager.m
+++ b/Firebase/Auth/Source/SystemService/FIRAuthStoredUserManager.m
@@ -82,7 +82,12 @@ - (FIRUser *)getStoredUserForAccessGroup:(NSString *)accessGroup
   query[(__bridge id)kSecAttrAccount] = kSharedKeychainAccountValue;
 
   NSData *data = [self.keychainServices getItemWithQuery:query error:outError];
+#if TARGET_OS_WATCH
+  NSError *error;
+  NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingFromData:data error:&error];
+#else
   NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
+#endif
   FIRUser *user = [unarchiver decodeObjectOfClass:[FIRUser class] forKey:kStoredUserCoderKey];
 
   return user;
@@ -100,10 +105,17 @@ - (BOOL)setStoredUser:(FIRUser *)user
   query[(__bridge id)kSecAttrService] = projectIdentifier;
   query[(__bridge id)kSecAttrAccount] = kSharedKeychainAccountValue;
 
+#if TARGET_OS_WATCH
+  NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initRequiringSecureCoding:false];
+#else
   NSMutableData *data = [NSMutableData data];
   NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
+#endif
   [archiver encodeObject:user forKey:kStoredUserCoderKey];
   [archiver finishEncoding];
+#if TARGET_OS_WATCH
+  NSData *data = archiver.encodedData;
+#endif
 
   return [self.keychainServices setItem:data withQuery:query error:outError];
 }
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthDefaultUIDelegate.m b/Firebase/Auth/Source/Utilities/FIRAuthDefaultUIDelegate.m
index f0447fefcf1..996d28f4ad8 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthDefaultUIDelegate.m
+++ b/Firebase/Auth/Source/Utilities/FIRAuthDefaultUIDelegate.m
@@ -15,7 +15,7 @@
  */
 
 #include <TargetConditionals.h>
-#if !TARGET_OS_OSX
+#if !TARGET_OS_OSX && !TARGET_OS_WATCH
 
 #import "FIRAuthDefaultUIDelegate.h"
 
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.h b/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.h
index 31bbf5b3119..96f7c062597 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.h
+++ b/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.h
@@ -563,6 +563,11 @@ NS_ASSUME_NONNULL_BEGIN
 */
 + (NSError *)missingOrInvalidNonceErrorWithMessage:(nullable NSString *)message;
 
+/** @fn gameCenterNotSupportedError
+    @brief Constructs an @c NSError with the @c FIRAuthErrorCodeInternalError code.
+    @return The NSError instance associated with the FIRAuthErrorCodeInternalError.
+ */
++ (NSError *)gameCenterNotSupportedError;
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.m b/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.m
index 146c14f29b9..3eef57e6059 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.m
+++ b/Firebase/Auth/Source/Utilities/FIRAuthErrorUtils.m
@@ -1200,6 +1200,10 @@ + (NSError *)keychainErrorWithFunction:(NSString *)keychainFunction status:(OSSt
   }];
 }
 
++ (NSError *)gameCenterNotSupportedError; {
+    return [self errorWithCode:FIRAuthInternalErrorCodeGameKitNotAvailable message:@"Game Center not supported on watchOS"];
+}
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthInternalErrors.h b/Firebase/Auth/Source/Utilities/FIRAuthInternalErrors.h
index 8f34bdfc8d3..4b4e5e685fc 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthInternalErrors.h
+++ b/Firebase/Auth/Source/Utilities/FIRAuthInternalErrors.h
@@ -393,6 +393,11 @@ typedef NS_ENUM(NSInteger, FIRAuthInternalErrorCode) {
   FIRAuthInternalErrorCodeGameKitNotLinked =
       FIRAuthPublicErrorCodeFlag | FIRAuthErrorCodeGameKitNotLinked,
 
+  /** Indicates that the Game Center is not available on this platform.
+   */
+  FIRAuthInternalErrorCodeGameKitNotAvailable =
+      FIRAuthPublicErrorCodeFlag | FIRAuthErrorCodeInternalError,
+
   /** Indicates that the nonce is missing or invalid.
    */
   FIRAuthInternalErrorCodeMissingOrInvalidNonce =
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthURLPresenter.m b/Firebase/Auth/Source/Utilities/FIRAuthURLPresenter.m
index 2a4329271e8..cb65c020bad 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthURLPresenter.m
+++ b/Firebase/Auth/Source/Utilities/FIRAuthURLPresenter.m
@@ -15,7 +15,7 @@
  */
 
 #include <TargetConditionals.h>
-#if !TARGET_OS_OSX && !TARGET_OS_TV
+#if !TARGET_OS_OSX && !TARGET_OS_TV && !TARGET_OS_WATCH
 
 #import "FIRAuthURLPresenter.h"
 
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthWebView.h b/Firebase/Auth/Source/Utilities/FIRAuthWebView.h
index 4b7a5836be0..632451e8fa8 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthWebView.h
+++ b/Firebase/Auth/Source/Utilities/FIRAuthWebView.h
@@ -15,7 +15,7 @@
  */
 
 #include <TargetConditionals.h>
-#if !TARGET_OS_OSX && !TARGET_OS_TV
+#if !TARGET_OS_OSX && !TARGET_OS_TV && !TARGET_OS_WATCH
 
 #import <UIKit/UIKit.h>
 #import <WebKit/WebKit.h>
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthWebView.m b/Firebase/Auth/Source/Utilities/FIRAuthWebView.m
index 7b3a9eda04d..1eefb5260c7 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthWebView.m
+++ b/Firebase/Auth/Source/Utilities/FIRAuthWebView.m
@@ -15,7 +15,7 @@
  */
 
 #include <TargetConditionals.h>
-#if !TARGET_OS_OSX && !TARGET_OS_TV
+#if !TARGET_OS_OSX && !TARGET_OS_TV && !TARGET_OS_WATCH
 
 #import "FIRAuthWebView.h"
 
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.h b/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.h
index 25926c59a3d..67ec4bb9061 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.h
+++ b/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.h
@@ -15,7 +15,7 @@
  */
 
 #include <TargetConditionals.h>
-#if !TARGET_OS_OSX && !TARGET_OS_TV
+#if !TARGET_OS_OSX && !TARGET_OS_TV && !TARGET_OS_WATCH
 
 #import <UIKit/UIKit.h>
 
diff --git a/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.m b/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.m
index 163bfe814ee..0deffafd16b 100644
--- a/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.m
+++ b/Firebase/Auth/Source/Utilities/FIRAuthWebViewController.m
@@ -15,7 +15,7 @@
  */
 
 #include <TargetConditionals.h>
-#if !TARGET_OS_OSX && !TARGET_OS_TV
+#if !TARGET_OS_OSX && !TARGET_OS_TV && !TARGET_OS_WATCH
 
 #import "FIRAuthWebViewController.h"
 
diff --git a/FirebaseAuth.podspec b/FirebaseAuth.podspec
index fb706dd1224..f63ecdc9493 100644
--- a/FirebaseAuth.podspec
+++ b/FirebaseAuth.podspec
@@ -20,6 +20,7 @@ supports email and password accounts, as well as several 3rd party authenticatio
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.11'
   s.tvos.deployment_target = '10.0'
+  s.watchos.deployment_target = '6.0'
 
   s.cocoapods_version = '>= 1.4.0'
   s.static_framework = true
@@ -47,6 +48,7 @@ supports email and password accounts, as well as several 3rd party authenticatio
   s.dependency 'GTMSessionFetcher/Core', '~> 1.1'
 
   s.test_spec 'unit' do |unit_tests|
+    unit_tests.platforms = {:ios => '8.0', :osx => '10.11', :tvos => '10.0'}
     unit_tests.source_files = 'Example/Auth/Tests/*.[mh]'
     unit_tests.osx.exclude_files = [
       'Example/Auth/Tests/FIRAuthAPNSTokenManagerTests.m',
diff --git a/FirebaseAuthInterop.podspec b/FirebaseAuthInterop.podspec
index df08e2a64da..727438e5c42 100644
--- a/FirebaseAuthInterop.podspec
+++ b/FirebaseAuthInterop.podspec
@@ -24,6 +24,7 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.11'
   s.tvos.deployment_target = '10.0'
+  s.watchos.deployment_target = '6.0'
   s.source_files = 'Interop/Auth/**/*.h'
   s.public_header_files = 'Interop/Auth/Public/*.h'
 end