diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d84ea8f..62c93061 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## v4.0.8 (Aug 22, 2023)
+
+### Features
+- Replaced `Map<String, String> templateVariables` with `Map<String, dynamic> templateVariables` in `NotificationData`.
+- Added `tags` in `NotificationData`.
+
+### Improvements
+- Improved stability.
+
 ## v4.0.7 (Aug 18, 2023)
 
 ### Features
diff --git a/README.md b/README.md
index 6fba0e84..b4931ad2 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ Before installing Sendbird Chat SDK, you need to create a Sendbird application o
 
 ```yaml
 dependencies:
-  sendbird_chat_sdk: ^4.0.7
+  sendbird_chat_sdk: ^4.0.8
 ```
 
 - Run `flutter pub get` command in your project directory.
diff --git a/lib/src/internal/main/chat/chat.dart b/lib/src/internal/main/chat/chat.dart
index 67a8fba4..ddcb892d 100644
--- a/lib/src/internal/main/chat/chat.dart
+++ b/lib/src/internal/main/chat/chat.dart
@@ -58,7 +58,7 @@ part 'chat_notifications.dart';
 part 'chat_push.dart';
 part 'chat_user.dart';
 
-const sdkVersion = '4.0.7';
+const sdkVersion = '4.0.8';
 
 // Internal implementation for main class. Do not directly access this class.
 class Chat with WidgetsBindingObserver {
diff --git a/lib/src/public/core/message/base_message.dart b/lib/src/public/core/message/base_message.dart
index 87e9c9d2..b5081fa9 100644
--- a/lib/src/public/core/message/base_message.dart
+++ b/lib/src/public/core/message/base_message.dart
@@ -575,14 +575,17 @@ abstract class BaseMessage {
         if (subData != null) {
           Map<String, dynamic>? subDataMap = jsonDecode(subData);
           if (subDataMap != null) {
-            final Map<String, String>? templateVariablesMap =
-                (subDataMap['template_variables'] as Map<String, dynamic>?)
-                    ?.map((key, value) => MapEntry(key, value as String));
+            final List<String>? tags = (subDataMap['tags'] as List<dynamic>?)
+                ?.map((value) => value as String)
+                .toList();
 
             message.notificationData = NotificationData(
               templateKey: subDataMap['template_key'] as String? ?? '',
-              templateVariables: templateVariablesMap ?? {},
+              templateVariables:
+                  subDataMap['template_variables'] as Map<String, dynamic>? ??
+                      {},
               label: subDataMap['label'] as String?,
+              tags: tags,
             );
           }
         }
diff --git a/lib/src/public/main/model/message/notification_data.dart b/lib/src/public/main/model/message/notification_data.dart
index 103c6560..d50438cb 100644
--- a/lib/src/public/main/model/message/notification_data.dart
+++ b/lib/src/public/main/model/message/notification_data.dart
@@ -10,16 +10,21 @@ class NotificationData {
   final String templateKey;
 
   /// templateVariables
-  /// @since 4.0.7
-  final Map<String, String> templateVariables;
+  /// @since 4.0.8
+  final Map<String, dynamic> templateVariables;
 
   /// label
   /// @since 4.0.7
   String? label;
 
+  /// tags
+  /// @since 4.0.8
+  List<String> tags;
+
   NotificationData({
     required this.templateKey,
     required this.templateVariables,
     this.label,
-  });
+    List<String>? tags,
+  }) : tags = tags ?? [];
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index 5c4c8ff9..0e75f433 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: sendbird_chat_sdk
 description: With Sendbird Chat for Flutter, you can easily build an in-app chat with all the essential messaging features.
-version: 4.0.7
+version: 4.0.8
 homepage: https://sendbird.com
 repository: https://github.com/sendbird/sendbird-chat-sdk-flutter
 documentation: https://sendbird.com/docs/chat/sdk/v4/flutter/getting-started/send-first-message