diff --git a/kits/flutter_ume_kit_dio/lib/src/models/http_interceptor.dart b/kits/flutter_ume_kit_dio/lib/src/models/http_interceptor.dart
index 7d1a7d05..0d1440d7 100644
--- a/kits/flutter_ume_kit_dio/lib/src/models/http_interceptor.dart
+++ b/kits/flutter_ume_kit_dio/lib/src/models/http_interceptor.dart
@@ -36,9 +36,10 @@ class UMEDioInterceptor extends Interceptor {
   @override
   void onError(DioError err, ErrorInterceptorHandler handler) {
     // Create an empty response with the [RequestOptions] for delivery.
-    err.response ??= Response<dynamic>(requestOptions: err.requestOptions);
-    err.response!.requestOptions.extra[DIO_EXTRA_END_TIME] = _timestamp;
-    InspectorInstance.httpContainer.addRequest(err.response!);
+    var error =
+        err.response ?? Response<dynamic>(requestOptions: err.requestOptions);
+    error.requestOptions.extra[DIO_EXTRA_END_TIME] = _timestamp;
+    InspectorInstance.httpContainer.addRequest(error);
     handler.next(err);
   }
 }
diff --git a/kits/flutter_ume_kit_dio/lib/src/widgets/pluggable_state.dart b/kits/flutter_ume_kit_dio/lib/src/widgets/pluggable_state.dart
index 0c92a681..73623f5f 100644
--- a/kits/flutter_ume_kit_dio/lib/src/widgets/pluggable_state.dart
+++ b/kits/flutter_ume_kit_dio/lib/src/widgets/pluggable_state.dart
@@ -233,7 +233,7 @@ class _ResponseCardState extends State<_ResponseCard> {
     final Map<String, List<String>> map = _request.headers.map(
       (key, value) => MapEntry(
         key,
-        value is Iterable ? value.map((v) => v.toString()).toList() : [value],
+        value is Iterable ? value.map((v) => v.toString()).toList() : [value.toString()],
       ),
     );
     final Headers headers = Headers.fromMap(map);
diff --git a/kits/flutter_ume_kit_dio/pubspec.yaml b/kits/flutter_ume_kit_dio/pubspec.yaml
index 7c759a88..9fb5c7ce 100644
--- a/kits/flutter_ume_kit_dio/pubspec.yaml
+++ b/kits/flutter_ume_kit_dio/pubspec.yaml
@@ -12,7 +12,7 @@ dependencies:
     sdk: flutter
   flutter_ume: ">=1.0.0 <2.0.0"
 
-  dio: ^4.0.0
+  dio: ^5.3.0
 
 dev_dependencies:
   flutter_test: