diff --git a/lib/src/adapters/dio_adapter.dart b/lib/src/adapters/dio_adapter.dart
index 2b40004..5993717 100644
--- a/lib/src/adapters/dio_adapter.dart
+++ b/lib/src/adapters/dio_adapter.dart
@@ -7,7 +7,7 @@ import 'package:http_mock_adapter/src/mixins/mixins.dart';
 import 'package:http_mock_adapter/src/response.dart';
 
 /// [HttpClientAdapter] extension with data mocking and recording functionality.
-class DioAdapter extends HttpClientAdapter with Recording, RequestHandling {
+class DioAdapter with Recording, RequestHandling implements HttpClientAdapter {
   /// State of [DioAdapter] that can be closed to prohibit functionality.
   bool _isClosed = false;
 
diff --git a/lib/src/exceptions.dart b/lib/src/exceptions.dart
index c179b64..c7275f7 100644
--- a/lib/src/exceptions.dart
+++ b/lib/src/exceptions.dart
@@ -11,7 +11,7 @@ class MockDioError extends DioError implements MockResponse {
   MockDioError({
     required RequestOptions requestOptions,
     Response? response,
-    DioErrorType type = DioErrorType.other,
+    DioErrorType type = DioErrorType.unknown,
     dynamic error,
     this.delay,
   }) : super(
diff --git a/lib/src/matchers/list_param.dart b/lib/src/matchers/list_param.dart
index 3a766df..dc45761 100644
--- a/lib/src/matchers/list_param.dart
+++ b/lib/src/matchers/list_param.dart
@@ -1,7 +1,5 @@
 import 'package:collection/collection.dart';
 import 'package:dio/dio.dart';
-// ignore: implementation_imports
-import 'package:dio/src/parameter.dart' show ListParam;
 import 'package:http_mock_adapter/src/matchers/matcher.dart';
 
 /// Matches [ListParam] instance by comparing
diff --git a/lib/src/matchers/matchers.dart b/lib/src/matchers/matchers.dart
index 1ab00d7..92c99a3 100644
--- a/lib/src/matchers/matchers.dart
+++ b/lib/src/matchers/matchers.dart
@@ -1,6 +1,4 @@
 import 'package:dio/dio.dart';
-// ignore: implementation_imports
-import 'package:dio/src/parameter.dart' show ListParam;
 import 'package:http_mock_adapter/src/matchers/any.dart';
 import 'package:http_mock_adapter/src/matchers/boolean.dart';
 import 'package:http_mock_adapter/src/matchers/decimal.dart';
diff --git a/lib/src/mixins/request_handling.dart b/lib/src/mixins/request_handling.dart
index 938209f..f33076b 100644
--- a/lib/src/mixins/request_handling.dart
+++ b/lib/src/mixins/request_handling.dart
@@ -2,7 +2,6 @@ import 'dart:convert';
 
 import 'package:dio/dio.dart';
 import 'package:http_mock_adapter/http_mock_adapter.dart';
-import 'package:http_mock_adapter/src/exceptions.dart';
 import 'package:http_mock_adapter/src/handlers/request_handler.dart';
 import 'package:http_mock_adapter/src/mixins/mixins.dart';
 import 'package:http_mock_adapter/src/request.dart';
@@ -27,12 +26,12 @@ mixin RequestHandling on Recording {
             'multipart/form-data; boundary=${data.boundary}';
         options.headers[Headers.contentLengthHeader] = data.length.toString();
       } else {
-        final _data = await dio.transformer.transformRequest(options);
+        final data = await dio.transformer.transformRequest(options);
         List<int> bytes;
         if (options.requestEncoder != null) {
-          bytes = options.requestEncoder!(_data, options);
+          bytes = options.requestEncoder!(data, options);
         } else {
-          bytes = utf8.encode(_data);
+          bytes = utf8.encode(data);
         }
         options.headers[Headers.contentLengthHeader] = bytes.length.toString();
       }
diff --git a/pubspec.yaml b/pubspec.yaml
index 59c5ae7..73a2a72 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,14 +6,14 @@ repository: https://github.com/lomsa-dev/http-mock-adapter
 issue_tracker: https://github.com/lomsa-dev/http-mock-adapter/issues
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.15.0 <3.0.0"
 
 dependencies:
   collection: ^1.15.0
-  dio: ^4.0.0
-  http_parser: ^4.0.0
+  dio: ^5.0.0
+  http_parser: ^4.0.2
 
 dev_dependencies:
-  lints: ^1.0.1
-  test: ^1.16.8
-  fake_async: ^1.2.0
+  lints: ^2.0.1
+  test: ^1.23.1
+  fake_async: ^1.3.1
diff --git a/test/adapters/dio_adapter_test.dart b/test/adapters/dio_adapter_test.dart
index e541732..53e5164 100644
--- a/test/adapters/dio_adapter_test.dart
+++ b/test/adapters/dio_adapter_test.dart
@@ -1,5 +1,6 @@
 import 'package:dio/dio.dart';
 import 'package:http_mock_adapter/http_mock_adapter.dart';
+import 'package:http_mock_adapter/src/exceptions.dart';
 import 'package:test/test.dart';
 
 import '../utils.dart';
@@ -24,13 +25,8 @@ void main() {
 
       expect(
         () async => await dio.get('/route'),
-        throwsA(
-          predicate(
-            (DioError dioError) => dioError.message.startsWith(
-              'ClosedException',
-            ),
-          ),
-        ),
+        throwsA(predicate(
+            (DioError dioError) => dioError.error is ClosedException)),
       );
     });
 
@@ -52,7 +48,7 @@ void main() {
     test('delays error', () async {
       const delay = 5000;
       final dioError = DioError(
-        type: DioErrorType.response,
+        type: DioErrorType.badResponse,
         requestOptions: RequestOptions(path: 'path'),
       );
 
diff --git a/test/extensions/matches_request_test.dart b/test/extensions/matches_request_test.dart
index 695a4a6..46a023b 100644
--- a/test/extensions/matches_request_test.dart
+++ b/test/extensions/matches_request_test.dart
@@ -168,7 +168,7 @@ void main() {
         late DioAdapter dioAdapter;
 
         setUpAll(() {
-          dio = Dio();
+          dio = Dio(BaseOptions(contentType: Headers.jsonContentType));
           dioAdapter = DioAdapter(dio: dio);
         });
 
@@ -247,7 +247,7 @@ void main() {
               () => dio.get(path),
               throwsA(predicate((e) =>
                   e is DioError &&
-                  e.type == DioErrorType.other &&
+                  e.type == DioErrorType.unknown &&
                   e.error is AssertionError)));
         });
       });
diff --git a/test/handlers/request_handler_test.dart b/test/handlers/request_handler_test.dart
index f053879..c562bc3 100644
--- a/test/handlers/request_handler_test.dart
+++ b/test/handlers/request_handler_test.dart
@@ -30,7 +30,7 @@ void main() {
       final mockResponseBody =
           statusHandler(RequestOptions(path: '')) as MockResponseBody;
 
-      final resolvedData = await DefaultTransformer().transformResponse(
+      final resolvedData = await BackgroundTransformer().transformResponse(
         RequestOptions(path: ''),
         mockResponseBody,
       );
@@ -61,7 +61,7 @@ void main() {
       final mockResponseBody =
           statusHandler(RequestOptions(path: '')) as MockResponseBody;
 
-      final resolvedData = await DefaultTransformer()
+      final resolvedData = await BackgroundTransformer()
           .transformResponse(RequestOptions(path: ''), mockResponseBody);
 
       expect(resolvedData, data);
@@ -91,7 +91,7 @@ void main() {
       final mockResponseBody =
           statusHandler(RequestOptions(path: '')) as MockResponseBody;
 
-      final resolvedData = await DefaultTransformer().transformResponse(
+      final resolvedData = await BackgroundTransformer().transformResponse(
         RequestOptions(path: ''),
         mockResponseBody,
       );
@@ -106,7 +106,7 @@ void main() {
         requestOptions: RequestOptions(
           path: 'path',
         ),
-        type: DioErrorType.response,
+        type: DioErrorType.badResponse,
       );
 
       requestHandler.throws(
diff --git a/test/matchers/http_matcher_test.dart b/test/matchers/http_matcher_test.dart
index 29d3426..e480ef4 100644
--- a/test/matchers/http_matcher_test.dart
+++ b/test/matchers/http_matcher_test.dart
@@ -63,7 +63,7 @@ void main() {
           queryParameters: <String, dynamic>{},
         ): true,
         Request(
-          route: path + '/url/request/matcher',
+          route: '$path/url/request/matcher',
           method: RequestMethods.post,
           queryParameters: <String, dynamic>{},
         ): false,
diff --git a/test/matchers/list_param_test.dart b/test/matchers/list_param_test.dart
index 91e7533..9600f37 100644
--- a/test/matchers/list_param_test.dart
+++ b/test/matchers/list_param_test.dart
@@ -1,5 +1,4 @@
 import 'package:dio/dio.dart';
-import 'package:dio/src/parameter.dart';
 import 'package:http_mock_adapter/http_mock_adapter.dart';
 import 'package:test/test.dart';
 
diff --git a/test/mixins/recording_test.dart b/test/mixins/recording_test.dart
index a8c30a2..30c1d09 100644
--- a/test/mixins/recording_test.dart
+++ b/test/mixins/recording_test.dart
@@ -65,11 +65,7 @@ void main() {
       expect(
         () async => await dio.get('/undefined'),
         throwsA(
-          predicate(
-            (DioError dioError) => dioError.message.startsWith(
-              'Assertion failed',
-            ),
-          ),
+          predicate((DioError dioError) => dioError.error is AssertionError),
         ),
       );
     });
diff --git a/test/mixins/request_handling_test.dart b/test/mixins/request_handling_test.dart
index 1b632b5..5c74479 100644
--- a/test/mixins/request_handling_test.dart
+++ b/test/mixins/request_handling_test.dart
@@ -106,7 +106,6 @@ void main() {
               'foo': 'bar',
             },
             headers: <String, Object?>{
-              Headers.contentTypeHeader: Headers.jsonContentType,
               Headers.contentLengthHeader: Matchers.integer,
             },
           );
@@ -130,7 +129,7 @@ void main() {
               statusCode: 500,
               requestOptions: RequestOptions(path: path),
             ),
-            type: DioErrorType.response,
+            type: DioErrorType.badResponse,
           );
 
           tester.onGet(
@@ -143,12 +142,7 @@ void main() {
           expect(
             () async => await dio.get(path),
             throwsA(
-              predicate(
-                (DioError error) =>
-                    error is DioError &&
-                    error is MockDioError &&
-                    error.message == dioError.error.toString(),
-              ),
+              predicate((DioError error) => error is MockDioError),
             ),
           );
         });