diff --git a/README.md b/README.md
index 22851cba..cd8042fa 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Add this to your package's `pubspec.yaml` file:
 
 ```yml
 dependencies:
-  appwrite: ^13.0.0
+  appwrite: ^13.1.0
 ```
 
 You can install packages from the command line:
diff --git a/lib/services/account.dart b/lib/services/account.dart
index a94a37d2..b812a903 100644
--- a/lib/services/account.dart
+++ b/lib/services/account.dart
@@ -85,7 +85,7 @@ class Account extends Service {
     return models.User.fromMap(res.data);
   }
 
-  /// List Identities
+  /// List identities
   ///
   /// Get the list of identities for the currently logged in user.
   Future<models.IdentityList> listIdentities({List<String>? queries}) async {
@@ -187,7 +187,7 @@ class Account extends Service {
     return models.User.fromMap(res.data);
   }
 
-  /// Create Authenticator
+  /// Create authenticator
   ///
   /// Add an authenticator app to be used as an MFA factor. Verify the
   /// authenticator using the [verify
@@ -210,7 +210,7 @@ class Account extends Service {
     return models.MfaType.fromMap(res.data);
   }
 
-  /// Verify Authenticator
+  /// Verify authenticator
   ///
   /// Verify an authenticator app after adding it using the [add
   /// authenticator](/docs/references/cloud/client-web/account#createMfaAuthenticator)
@@ -234,7 +234,7 @@ class Account extends Service {
     return models.User.fromMap(res.data);
   }
 
-  /// Delete Authenticator
+  /// Delete authenticator
   ///
   /// Delete an authenticator for a user by ID.
   Future deleteMfaAuthenticator({required enums.AuthenticatorType type}) async {
@@ -253,7 +253,7 @@ class Account extends Service {
     return res.data;
   }
 
-  /// Create MFA Challenge
+  /// Create MFA challenge
   ///
   /// Begin the process of MFA verification after sign-in. Finish the flow with
   /// [updateMfaChallenge](/docs/references/cloud/client-web/account#updateMfaChallenge)
@@ -276,7 +276,7 @@ class Account extends Service {
     return models.MfaChallenge.fromMap(res.data);
   }
 
-  /// Create MFA Challenge (confirmation)
+  /// Create MFA challenge (confirmation)
   ///
   /// Complete the MFA challenge by providing the one-time password. Finish the
   /// process of MFA verification by providing the one-time password. To begin
@@ -302,7 +302,7 @@ class Account extends Service {
     return res.data;
   }
 
-  /// List Factors
+  /// List factors
   ///
   /// List the factors available on the account to be used as a MFA challange.
   Future<models.MfaFactors> listMfaFactors() async {
@@ -320,7 +320,7 @@ class Account extends Service {
     return models.MfaFactors.fromMap(res.data);
   }
 
-  /// Get MFA Recovery Codes
+  /// Get MFA recovery codes
   ///
   /// Get recovery codes that can be used as backup for MFA flow. Before getting
   /// codes, they must be generated using
@@ -341,7 +341,7 @@ class Account extends Service {
     return models.MfaRecoveryCodes.fromMap(res.data);
   }
 
-  /// Create MFA Recovery Codes
+  /// Create MFA recovery codes
   ///
   /// Generate recovery codes as backup for MFA flow. It's recommended to
   /// generate and show then immediately after user successfully adds their
@@ -363,7 +363,7 @@ class Account extends Service {
     return models.MfaRecoveryCodes.fromMap(res.data);
   }
 
-  /// Regenerate MFA Recovery Codes
+  /// Regenerate MFA recovery codes
   ///
   /// Regenerate recovery codes that can be used as backup for MFA flow. Before
   /// regenerating codes, they must be first generated using
diff --git a/lib/services/locale.dart b/lib/services/locale.dart
index 6c780391..5779b36a 100644
--- a/lib/services/locale.dart
+++ b/lib/services/locale.dart
@@ -29,7 +29,7 @@ class Locale extends Service {
     return models.Locale.fromMap(res.data);
   }
 
-  /// List Locale Codes
+  /// List locale codes
   ///
   /// List of all locale codes in [ISO
   /// 639-1](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes).
diff --git a/lib/services/storage.dart b/lib/services/storage.dart
index d4ba05a2..082b5d4d 100644
--- a/lib/services/storage.dart
+++ b/lib/services/storage.dart
@@ -133,7 +133,7 @@ class Storage extends Service {
     return models.File.fromMap(res.data);
   }
 
-  /// Delete File
+  /// Delete file
   ///
   /// Delete a file by its unique ID. Only users with write permissions have
   /// access to delete this resource.
diff --git a/lib/services/teams.dart b/lib/services/teams.dart
index a9c7450d..ea043121 100644
--- a/lib/services/teams.dart
+++ b/lib/services/teams.dart
@@ -116,7 +116,8 @@ class Teams extends Service {
   /// List team memberships
   ///
   /// Use this endpoint to list a team's members using the team's ID. All team
-  /// members have read access to this endpoint.
+  /// members have read access to this endpoint. Hide sensitive attributes from
+  /// the response by toggling membership privacy in the Console.
   Future<models.MembershipList> listMemberships(
       {required String teamId, List<String>? queries, String? search}) async {
     final String apiPath =
@@ -193,7 +194,8 @@ class Teams extends Service {
   /// Get team membership
   ///
   /// Get a team member by the membership unique id. All team members have read
-  /// access for this resource.
+  /// access for this resource. Hide sensitive attributes from the response by
+  /// toggling membership privacy in the Console.
   Future<models.Membership> getMembership(
       {required String teamId, required String membershipId}) async {
     final String apiPath = '/teams/{teamId}/memberships/{membershipId}'
diff --git a/lib/src/client_browser.dart b/lib/src/client_browser.dart
index 36402189..cbb30342 100644
--- a/lib/src/client_browser.dart
+++ b/lib/src/client_browser.dart
@@ -43,7 +43,7 @@ class ClientBrowser extends ClientBase with ClientMixin {
       'x-sdk-name': 'Flutter',
       'x-sdk-platform': 'client',
       'x-sdk-language': 'flutter',
-      'x-sdk-version': '13.0.0',
+      'x-sdk-version': '13.1.0',
       'X-Appwrite-Response-Format': '1.6.0',
     };
 
diff --git a/lib/src/client_io.dart b/lib/src/client_io.dart
index cab345ff..bfd770a3 100644
--- a/lib/src/client_io.dart
+++ b/lib/src/client_io.dart
@@ -64,7 +64,7 @@ class ClientIO extends ClientBase with ClientMixin {
       'x-sdk-name': 'Flutter',
       'x-sdk-platform': 'client',
       'x-sdk-language': 'flutter',
-      'x-sdk-version': '13.0.0',
+      'x-sdk-version': '13.1.0',
       'X-Appwrite-Response-Format': '1.6.0',
     };
 
diff --git a/lib/src/enums/image_format.dart b/lib/src/enums/image_format.dart
index 2ab5d7b9..acc07f27 100644
--- a/lib/src/enums/image_format.dart
+++ b/lib/src/enums/image_format.dart
@@ -5,7 +5,8 @@ enum ImageFormat {
   jpeg(value: 'jpeg'),
   gif(value: 'gif'),
   png(value: 'png'),
-  webp(value: 'webp');
+  webp(value: 'webp'),
+  avif(value: 'avif');
 
   const ImageFormat({required this.value});
 
diff --git a/lib/src/models/document.dart b/lib/src/models/document.dart
index 6406f06a..f8164b61 100644
--- a/lib/src/models/document.dart
+++ b/lib/src/models/document.dart
@@ -18,7 +18,7 @@ class Document implements Model {
   final String $updatedAt;
 
   /// Document permissions. [Learn more about permissions](https://appwrite.io/docs/permissions).
-  final List $permissions;
+  final List<String> $permissions;
   final Map<String, dynamic> data;
 
   Document({
diff --git a/lib/src/models/execution.dart b/lib/src/models/execution.dart
index 40886cd7..9f9b8917 100644
--- a/lib/src/models/execution.dart
+++ b/lib/src/models/execution.dart
@@ -12,7 +12,7 @@ class Execution implements Model {
   final String $updatedAt;
 
   /// Execution roles.
-  final List $permissions;
+  final List<String> $permissions;
 
   /// Function ID.
   final String functionId;
diff --git a/lib/src/models/file.dart b/lib/src/models/file.dart
index 2e6b9d8f..4bca1fe3 100644
--- a/lib/src/models/file.dart
+++ b/lib/src/models/file.dart
@@ -15,7 +15,7 @@ class File implements Model {
   final String $updatedAt;
 
   /// File permissions. [Learn more about permissions](https://appwrite.io/docs/permissions).
-  final List $permissions;
+  final List<String> $permissions;
 
   /// File name.
   final String name;
diff --git a/lib/src/models/membership.dart b/lib/src/models/membership.dart
index fb3fb523..1dd1186d 100644
--- a/lib/src/models/membership.dart
+++ b/lib/src/models/membership.dart
@@ -14,10 +14,10 @@ class Membership implements Model {
   /// User ID.
   final String userId;
 
-  /// User name.
+  /// User name. Hide this attribute by toggling membership privacy in the Console.
   final String userName;
 
-  /// User email address.
+  /// User email address. Hide this attribute by toggling membership privacy in the Console.
   final String userEmail;
 
   /// Team ID.
@@ -35,11 +35,11 @@ class Membership implements Model {
   /// User confirmation status, true if the user has joined the team or false otherwise.
   final bool confirm;
 
-  /// Multi factor authentication status, true if the user has MFA enabled or false otherwise.
+  /// Multi factor authentication status, true if the user has MFA enabled or false otherwise. Hide this attribute by toggling membership privacy in the Console.
   final bool mfa;
 
   /// User list of roles
-  final List roles;
+  final List<String> roles;
 
   Membership({
     required this.$id,
diff --git a/lib/src/models/mfa_recovery_codes.dart b/lib/src/models/mfa_recovery_codes.dart
index 83483901..c304de00 100644
--- a/lib/src/models/mfa_recovery_codes.dart
+++ b/lib/src/models/mfa_recovery_codes.dart
@@ -3,7 +3,7 @@ part of '../../models.dart';
 /// MFA Recovery Codes
 class MfaRecoveryCodes implements Model {
   /// Recovery codes.
-  final List recoveryCodes;
+  final List<String> recoveryCodes;
 
   MfaRecoveryCodes({
     required this.recoveryCodes,
diff --git a/lib/src/models/session.dart b/lib/src/models/session.dart
index 1f55d400..11732bd1 100644
--- a/lib/src/models/session.dart
+++ b/lib/src/models/session.dart
@@ -81,7 +81,7 @@ class Session implements Model {
   final bool current;
 
   /// Returns a list of active session factors.
-  final List factors;
+  final List<String> factors;
 
   /// Secret used to authenticate the user. Only included if the request was made with an API key
   final String secret;
diff --git a/lib/src/models/target.dart b/lib/src/models/target.dart
index 68460126..4be8b545 100644
--- a/lib/src/models/target.dart
+++ b/lib/src/models/target.dart
@@ -26,6 +26,9 @@ class Target implements Model {
   /// The target identifier.
   final String identifier;
 
+  /// Is the target expired.
+  final bool expired;
+
   Target({
     required this.$id,
     required this.$createdAt,
@@ -35,6 +38,7 @@ class Target implements Model {
     this.providerId,
     required this.providerType,
     required this.identifier,
+    required this.expired,
   });
 
   factory Target.fromMap(Map<String, dynamic> map) {
@@ -47,6 +51,7 @@ class Target implements Model {
       providerId: map['providerId']?.toString(),
       providerType: map['providerType'].toString(),
       identifier: map['identifier'].toString(),
+      expired: map['expired'],
     );
   }
 
@@ -60,6 +65,7 @@ class Target implements Model {
       "providerId": providerId,
       "providerType": providerType,
       "identifier": identifier,
+      "expired": expired,
     };
   }
 }
diff --git a/lib/src/models/user.dart b/lib/src/models/user.dart
index 889005cf..e5942793 100644
--- a/lib/src/models/user.dart
+++ b/lib/src/models/user.dart
@@ -30,7 +30,7 @@ class User implements Model {
   final bool status;
 
   /// Labels for the user.
-  final List labels;
+  final List<String> labels;
 
   /// Password update time in ISO 8601 format.
   final String passwordUpdate;
diff --git a/lib/src/realtime_mixin.dart b/lib/src/realtime_mixin.dart
index be87c1bf..60ec7491 100644
--- a/lib/src/realtime_mixin.dart
+++ b/lib/src/realtime_mixin.dart
@@ -27,8 +27,10 @@ mixin RealtimeMixin {
   int _retries = 0;
   StreamSubscription? _websocketSubscription;
   bool _creatingSocket = false;
+  Timer? _heartbeatTimer;
 
   Future<dynamic> _closeConnection() async {
+    _stopHeartbeat();
     await _websocketSubscription?.cancel();
     await _websok?.sink.close(status.normalClosure, 'Ending session');
     _lastUrl = null;
@@ -36,6 +38,20 @@ mixin RealtimeMixin {
     _reconnect = false;
   }
 
+  void _startHeartbeat() {
+    _stopHeartbeat();
+    _heartbeatTimer = Timer.periodic(Duration(seconds: 20), (_) {
+      if (_websok != null) {
+        _websok!.sink.add(jsonEncode({"type": "ping"}));
+      }
+    });
+  }
+
+  void _stopHeartbeat() {
+    _heartbeatTimer?.cancel();
+    _heartbeatTimer = null;
+  }
+
   _createSocket() async {
     if (_creatingSocket || _channels.isEmpty) return;
     _creatingSocket = true;
@@ -78,6 +94,10 @@ mixin RealtimeMixin {
                 }));
               }
             }
+            _startHeartbeat(); // Start heartbeat after successful connection
+            break;
+          case 'pong':
+            debugPrint('Received heartbeat response from realtime server');
             break;
           case 'event':
             final message = RealtimeMessage.fromMap(data.data);
@@ -91,8 +111,10 @@ mixin RealtimeMixin {
             break;
         }
       }, onDone: () {
+        _stopHeartbeat();
         _retry();
       }, onError: (err, stack) {
+        _stopHeartbeat();
         for (var subscription in _subscriptions.values) {
           subscription.controller.addError(err, stack);
         }
diff --git a/pubspec.yaml b/pubspec.yaml
index 20102ea9..d647dfae 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: appwrite
-version: 13.0.0
+version: 13.1.0
 description: Appwrite is an open-source self-hosted backend server that abstract and simplify complex and repetitive development tasks behind a very simple REST API
 homepage: https://appwrite.io
 repository: https://github.com/appwrite/sdk-for-flutter
diff --git a/test/services/account_test.dart b/test/services/account_test.dart
index 3f76e30c..2473d490 100644
--- a/test/services/account_test.dart
+++ b/test/services/account_test.dart
@@ -1011,10 +1011,11 @@ void main() {
                 '\$id': '259125845563242502',
                 '\$createdAt': '2020-10-15T06:38:00.000+00:00',
                 '\$updatedAt': '2020-10-15T06:38:00.000+00:00',
-                'name': 'Aegon apple token',
+                'name': 'Apple iPhone 12',
                 'userId': '259125845563242502',
                 'providerType': 'email',
-                'identifier': 'token',};
+                'identifier': 'token',
+                'expired': true,};
 
 
             when(client.call(
@@ -1035,10 +1036,11 @@ void main() {
                 '\$id': '259125845563242502',
                 '\$createdAt': '2020-10-15T06:38:00.000+00:00',
                 '\$updatedAt': '2020-10-15T06:38:00.000+00:00',
-                'name': 'Aegon apple token',
+                'name': 'Apple iPhone 12',
                 'userId': '259125845563242502',
                 'providerType': 'email',
-                'identifier': 'token',};
+                'identifier': 'token',
+                'expired': true,};
 
 
             when(client.call(
diff --git a/test/services/functions_test.dart b/test/services/functions_test.dart
index 8707d054..9f13895a 100644
--- a/test/services/functions_test.dart
+++ b/test/services/functions_test.dart
@@ -85,7 +85,7 @@ void main() {
                 'requestPath': '/articles?id=5',
                 'requestHeaders': [],
                 'responseStatusCode': 200,
-                'responseBody': 'Developers are awesome.',
+                'responseBody': '',
                 'responseHeaders': [],
                 'logs': '',
                 'errors': '',
@@ -117,7 +117,7 @@ void main() {
                 'requestPath': '/articles?id=5',
                 'requestHeaders': [],
                 'responseStatusCode': 200,
-                'responseBody': 'Developers are awesome.',
+                'responseBody': '',
                 'responseHeaders': [],
                 'logs': '',
                 'errors': '',
diff --git a/test/src/models/execution_test.dart b/test/src/models/execution_test.dart
index 33f487c5..8160e51e 100644
--- a/test/src/models/execution_test.dart
+++ b/test/src/models/execution_test.dart
@@ -17,7 +17,7 @@ void main() {
         requestPath: '/articles?id=5',
         requestHeaders: [],
         responseStatusCode: 200,
-        responseBody: 'Developers are awesome.',
+        responseBody: '',
         responseHeaders: [],
         logs: '',
         errors: '',
@@ -38,7 +38,7 @@ void main() {
       expect(result.requestPath, '/articles?id=5');
       expect(result.requestHeaders, []);
       expect(result.responseStatusCode, 200);
-      expect(result.responseBody, 'Developers are awesome.');
+      expect(result.responseBody, '');
       expect(result.responseHeaders, []);
       expect(result.logs, '');
       expect(result.errors, '');
diff --git a/test/src/models/target_test.dart b/test/src/models/target_test.dart
index 15d18262..20b4dfeb 100644
--- a/test/src/models/target_test.dart
+++ b/test/src/models/target_test.dart
@@ -9,10 +9,11 @@ void main() {
         $id: '259125845563242502',
         $createdAt: '2020-10-15T06:38:00.000+00:00',
         $updatedAt: '2020-10-15T06:38:00.000+00:00',
-        name: 'Aegon apple token',
+        name: 'Apple iPhone 12',
         userId: '259125845563242502',
         providerType: 'email',
         identifier: 'token',
+        expired: true,
       );
 
       final map = model.toMap();
@@ -21,10 +22,11 @@ void main() {
       expect(result.$id, '259125845563242502');
       expect(result.$createdAt, '2020-10-15T06:38:00.000+00:00');
       expect(result.$updatedAt, '2020-10-15T06:38:00.000+00:00');
-      expect(result.name, 'Aegon apple token');
+      expect(result.name, 'Apple iPhone 12');
       expect(result.userId, '259125845563242502');
       expect(result.providerType, 'email');
       expect(result.identifier, 'token');
+      expect(result.expired, true);
     });
   });
 }