diff --git a/packages/stream_chat/CHANGELOG.md b/packages/stream_chat/CHANGELOG.md
index 04a47600..cd32c621 100644
--- a/packages/stream_chat/CHANGELOG.md
+++ b/packages/stream_chat/CHANGELOG.md
@@ -3,6 +3,7 @@
 🐞 Fixed
 
 - Fixed streamWatchers. Before it was always new, now it is possible to follow the watchers of a channel.
+- Make `Message.i18n` field read-only.
 
 🔄 Changed
 
diff --git a/packages/stream_chat/lib/src/core/models/message.dart b/packages/stream_chat/lib/src/core/models/message.dart
index 017bb06f..3645b00a 100644
--- a/packages/stream_chat/lib/src/core/models/message.dart
+++ b/packages/stream_chat/lib/src/core/models/message.dart
@@ -217,7 +217,7 @@ class Message extends Equatable {
   bool get isEphemeral => type == 'ephemeral';
 
   /// A Map of translations.
-  @JsonKey(includeIfNull: false)
+  @JsonKey(includeIfNull: false, toJson: Serializer.readOnly)
   final Map<String, String>? i18n;
 
   /// Known top level fields.
diff --git a/packages/stream_chat/lib/src/core/models/message.g.dart b/packages/stream_chat/lib/src/core/models/message.g.dart
index e2ff89b4..695e6332 100644
--- a/packages/stream_chat/lib/src/core/models/message.g.dart
+++ b/packages/stream_chat/lib/src/core/models/message.g.dart
@@ -108,6 +108,6 @@ Map<String, dynamic> _$MessageToJson(Message instance) {
   val['pin_expires'] = instance.pinExpires?.toIso8601String();
   val['pinned_by'] = readonly(instance.pinnedBy);
   val['extra_data'] = instance.extraData;
-  writeNotNull('i18n', instance.i18n);
+  writeNotNull('i18n', readonly(instance.i18n));
   return val;
 }
diff --git a/packages/stream_chat/test/src/core/api/message_api_test.dart b/packages/stream_chat/test/src/core/api/message_api_test.dart
index ed7fefd6..8ae82e94 100644
--- a/packages/stream_chat/test/src/core/api/message_api_test.dart
+++ b/packages/stream_chat/test/src/core/api/message_api_test.dart
@@ -394,7 +394,12 @@ void main() {
           path,
           data: {'language': language},
         )).thenAnswer((_) async => successResponse(path, data: {
-          'message': translatedMessage.toJson(),
+          'message': {
+            ...translatedMessage.toJson(),
+            'i18n': {
+              language: translatedMessageText,
+            },
+          },
         }));
 
     final res = await messageApi.translateMessage(messageId, language);