diff --git a/lib/src/model/item_update.dart b/lib/src/model/item_update.dart
index 72c79cf..b266fd4 100644
--- a/lib/src/model/item_update.dart
+++ b/lib/src/model/item_update.dart
@@ -9,8 +9,8 @@ part 'item_update.g.dart';
 /// * [oldItem]
 @JsonSerializable()
 class ItemUpdate {
-  final Map<String, String> item;
-  final Map<String, String> oldItem;
+  final Map<String, dynamic> item;
+  final Map<String, dynamic> oldItem;
 
   const ItemUpdate({
     required this.item,
diff --git a/lib/src/model/item_update.g.dart b/lib/src/model/item_update.g.dart
index 5e43af1..02e0795 100644
--- a/lib/src/model/item_update.g.dart
+++ b/lib/src/model/item_update.g.dart
@@ -7,8 +7,8 @@ part of 'item_update.dart';
 // **************************************************************************
 
 ItemUpdate _$ItemUpdateFromJson(Map<String, dynamic> json) => ItemUpdate(
-      item: Map<String, String>.from(json['item'] as Map),
-      oldItem: Map<String, String>.from(json['oldItem'] as Map),
+      item: json['item'] as Map<String, dynamic>,
+      oldItem: json['oldItem'] as Map<String, dynamic>,
     );
 
 Map<String, dynamic> _$ItemUpdateToJson(ItemUpdate instance) =>