diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 1d07d3806..aed130583 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -44,7 +44,7 @@ jobs:
       - uses: subosito/flutter-action@1a449444c387b1966244ae4d4f8c696479add0b2 #v2.23.0
         with:
           cache: true
-          flutter-version: ${{ case(matrix.sdk == 'min', '3.3.0', '') }}
+          flutter-version: ${{ case(matrix.sdk == 'min', '3.19.0', '') }}
           channel: ${{ case(matrix.sdk == 'min', '', matrix.channel) }}
       - run: |
           echo "TARGET_DART_SDK=$TARGET_DART_SDK" >> $GITHUB_ENV
@@ -55,10 +55,7 @@ jobs:
       - uses: bluefireteam/melos-action@2982f8e4fc92440a219490009d6d05195cb1a6a5 #v3.8.0
         with:
           run-bootstrap: false
-          melos-version: ${{ case(matrix.sdk == 'min', '3.4.0', '^6.0.0') }}
-      - name: Remove dio_web_adapter overrides
-        if: ${{ matrix.sdk == 'min' }}
-        run: rm -rf plugins/web_adapter
+          melos-version: ^6.0.0
       - name: Check satisfied packages
         run: |
           dart ./scripts/melos_packages.dart
diff --git a/dio/CHANGELOG.md b/dio/CHANGELOG.md
index 8089c2f21..2e917f981 100644
--- a/dio/CHANGELOG.md
+++ b/dio/CHANGELOG.md
@@ -5,7 +5,8 @@ See the [Migration Guide][] for the complete breaking changes list.**
 
 ## Unreleased
 
-*None.*
+- Raise minimum Dart SDK version to 3.3.0 and `dio_web_adapter` constraint to `^2.0.0`.
+- Remove legacy `dart.library.html` conditional imports and simplify `kIsWeb` check to `dart.library.js_interop`.
 
 ## 5.11.1
 
diff --git a/dio/lib/src/adapter.dart b/dio/lib/src/adapter.dart
index 309d9037d..d24c7266b 100644
--- a/dio/lib/src/adapter.dart
+++ b/dio/lib/src/adapter.dart
@@ -4,8 +4,7 @@ import 'dart:typed_data';
 import 'package:meta/meta.dart';
 
 import 'adapters/io_adapter.dart'
-    if (dart.library.js_interop) 'adapters/browser_adapter.dart'
-    if (dart.library.html) 'adapters/browser_adapter.dart' as adapter;
+    if (dart.library.js_interop) 'adapters/browser_adapter.dart' as adapter;
 import 'headers.dart';
 import 'options.dart';
 import 'redirect_record.dart';
@@ -22,7 +21,7 @@ import 'redirect_record.dart';
 ///
 /// If you want to customize the [HttpClientAdapter] you should instead use
 /// either [IOHttpClientAdapter] on `dart:io` platforms
-/// or [BrowserHttpClientAdapter] on `dart:html` platforms.
+/// or [BrowserHttpClientAdapter] on web platforms.
 /// {@endtemplate}
 abstract class HttpClientAdapter {
   /// Create a [HttpClientAdapter] based on the current platform (IO/Web).
diff --git a/dio/lib/src/compute/compute.dart b/dio/lib/src/compute/compute.dart
index 5a2e6df24..2c93ed7c9 100644
--- a/dio/lib/src/compute/compute.dart
+++ b/dio/lib/src/compute/compute.dart
@@ -25,9 +25,7 @@
 
 import 'dart:async';
 
-import 'compute_io.dart'
-    if (dart.library.js_interop) 'compute_web.dart'
-    if (dart.library.html) 'compute_web.dart' as _c;
+import 'compute_io.dart' if (dart.library.js_interop) 'compute_web.dart' as _c;
 
 /// Signature for the callback passed to [compute].
 ///
diff --git a/dio/lib/src/dio.dart b/dio/lib/src/dio.dart
index 18607706f..82af157f2 100644
--- a/dio/lib/src/dio.dart
+++ b/dio/lib/src/dio.dart
@@ -3,8 +3,7 @@ import 'dart:async';
 import 'adapter.dart';
 import 'cancel_token.dart';
 import 'dio/dio_for_native.dart'
-    if (dart.library.js_interop) 'dio/dio_for_browser.dart'
-    if (dart.library.html) 'dio/dio_for_browser.dart';
+    if (dart.library.js_interop) 'dio/dio_for_browser.dart';
 import 'dio_mixin.dart';
 import 'headers.dart';
 import 'options.dart';
diff --git a/dio/lib/src/dio_mixin.dart b/dio/lib/src/dio_mixin.dart
index 97fd0e043..5c3317b4d 100644
--- a/dio/lib/src/dio_mixin.dart
+++ b/dio/lib/src/dio_mixin.dart
@@ -16,16 +16,14 @@ import 'headers.dart';
 import 'interceptors/imply_content_type.dart';
 import 'options.dart';
 import 'progress_stream/io_progress_stream.dart'
-    if (dart.library.js_interop) 'progress_stream/browser_progress_stream.dart'
-    if (dart.library.html) 'progress_stream/browser_progress_stream.dart';
+    if (dart.library.js_interop) 'progress_stream/browser_progress_stream.dart';
 import 'response.dart';
 import 'response/response_stream_handler.dart';
 import 'transformer.dart';
 
 part 'interceptor.dart';
 
-// TODO(EVERYONE): Use `mixin class` when the lower bound of SDK is raised to 3.0.0.
-abstract class DioMixin implements Dio {
+abstract mixin class DioMixin implements Dio {
   /// The base request config for the instance.
   @override
   late BaseOptions options;
diff --git a/dio/lib/src/multipart_file.dart b/dio/lib/src/multipart_file.dart
index e89022497..b870a8904 100644
--- a/dio/lib/src/multipart_file.dart
+++ b/dio/lib/src/multipart_file.dart
@@ -5,8 +5,7 @@ import 'package:http_parser/http_parser.dart' show MediaType;
 import 'package:mime/mime.dart' show lookupMimeType;
 
 import 'multipart_file/io_multipart_file.dart'
-    if (dart.library.js_interop) 'multipart_file/browser_multipart_file.dart'
-    if (dart.library.html) 'multipart_file/browser_multipart_file.dart';
+    if (dart.library.js_interop) 'multipart_file/browser_multipart_file.dart';
 import 'utils.dart';
 
 /// The type (alias) for specifying the content-type of the `MultipartFile`.
diff --git a/dio/lib/src/utils.dart b/dio/lib/src/utils.dart
index f2f83038e..e0f9eba3e 100644
--- a/dio/lib/src/utils.dart
+++ b/dio/lib/src/utils.dart
@@ -7,9 +7,7 @@ import 'options.dart';
 import 'parameter.dart';
 
 // See https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/foundation/constants.dart.
-const _kIsWebInterop = bool.fromEnvironment('dart.library.js_interop');
-const _kIsWebUtil = bool.fromEnvironment('dart.library.js_util');
-const kIsWeb = _kIsWebInterop || _kIsWebUtil || identical(0, 0.0);
+const kIsWeb = bool.fromEnvironment('dart.library.js_interop');
 
 // For the web platform, an inline `bool.fromEnvironment` translates to
 // `core.bool.fromEnvironment` instead of correctly being replaced by the
diff --git a/dio/pubspec.yaml b/dio/pubspec.yaml
index c5ff446cd..f37528a92 100644
--- a/dio/pubspec.yaml
+++ b/dio/pubspec.yaml
@@ -17,7 +17,7 @@ repository: https://github.com/cfug/dio/blob/main/dio
 issue_tracker: https://github.com/cfug/dio/issues
 
 environment:
-  sdk: '>=2.18.0 <4.0.0'
+  sdk: ^3.3.0
 
 dependencies:
   async: ^2.8.2
@@ -27,7 +27,7 @@ dependencies:
   mime: '>=1.0.0 <3.0.0'
   path: ^1.8.0
 
-  dio_web_adapter: '>=1.1.0 <3.0.0'
+  dio_web_adapter: ^2.0.0
 
 dev_dependencies:
   lints: any
diff --git a/dio/test/interceptor_test.dart b/dio/test/interceptor_test.dart
index c84d42c80..f4f192941 100644
--- a/dio/test/interceptor_test.dart
+++ b/dio/test/interceptor_test.dart
@@ -113,53 +113,44 @@ void main() {
               switch (reqOpt.path) {
                 case '/resolve':
                   handler.resolve(Response(requestOptions: reqOpt, data: 1));
-                  break;
                 case '/resolve-next':
                   handler.resolve(
                     Response(requestOptions: reqOpt, data: 2),
                     true,
                   );
-                  break;
                 case '/resolve-next/always':
                   handler.resolve(
                     Response(requestOptions: reqOpt, data: 2),
                     true,
                   );
-                  break;
                 case '/resolve-next/reject':
                   handler.resolve(
                     Response(requestOptions: reqOpt, data: 2),
                     true,
                   );
-                  break;
                 case '/resolve-next/reject-next':
                   handler.resolve(
                     Response(requestOptions: reqOpt, data: 2),
                     true,
                   );
-                  break;
                 case '/reject':
                   handler
                       .reject(DioException(requestOptions: reqOpt, error: 3));
-                  break;
                 case '/reject-next':
                   handler.reject(
                     DioException(requestOptions: reqOpt, error: 4),
                     true,
                   );
-                  break;
                 case '/reject-next/reject':
                   handler.reject(
                     DioException(requestOptions: reqOpt, error: 5),
                     true,
                   );
-                  break;
                 case '/reject-next-response':
                   handler.reject(
                     DioException(requestOptions: reqOpt, error: 5),
                     true,
                   );
-                  break;
                 default:
                   handler.next(reqOpt); //continue
               }
@@ -172,11 +163,9 @@ void main() {
                 case '/resolve-next':
                   response.data++;
                   handler.resolve(response); //3
-                  break;
                 case '/resolve-next/always':
                   response.data++;
                   handler.next(response); //3
-                  break;
                 case '/resolve-next/reject':
                   handler.reject(
                     DioException(
@@ -184,13 +173,11 @@ void main() {
                       error: '/resolve-next/reject',
                     ),
                   );
-                  break;
                 case '/resolve-next/reject-next':
                   handler.reject(
                     DioException(requestOptions: options, error: ''),
                     true,
                   );
-                  break;
                 default:
                   handler.next(response); //continue
               }
@@ -227,7 +214,6 @@ void main() {
                 case '/resolve-next/always':
                   response.data++;
                   handler.next(response); //4
-                  break;
                 default:
                   handler.next(response); //continue
               }
@@ -337,13 +323,11 @@ void main() {
                     data: 'fake data',
                   ),
                 );
-                break;
               case '/fakepath2':
                 dio
                     .get('/test')
                     .then(handler.resolve)
                     .catchError((e) => handler.reject(e as DioException));
-                break;
               case '/fakepath3':
                 handler.reject(
                   DioException(
@@ -351,7 +335,6 @@ void main() {
                     error: 'test error',
                   ),
                 );
-                break;
               case '/fakepath4':
                 handler.reject(
                   DioException(
@@ -359,13 +342,11 @@ void main() {
                     error: 'test error',
                   ),
                 );
-                break;
               case '/test?tag=1':
                 dio.get('/token').then((response) {
                   options.headers['token'] = response.data['data']['token'];
                   handler.next(options);
                 });
-                break;
               default:
                 handler.next(options); //continue
             }
diff --git a/dio/test/transformer_test.dart b/dio/test/transformer_test.dart
index ab0ed8d33..1208564ca 100644
--- a/dio/test/transformer_test.dart
+++ b/dio/test/transformer_test.dart
@@ -46,15 +46,10 @@ void main() {
         case ResponseType.json:
         case ResponseType.plain:
           expect(response, '');
-          break;
         case ResponseType.stream:
           expect(response, isA<ResponseBody>());
-          break;
         case ResponseType.bytes:
           expect(response, []);
-          break;
-        default:
-          throw AssertionError('Unknown response type: $responseType');
       }
     }
     final jsonResponse = await transformer.transformResponse(
@@ -360,15 +355,10 @@ void main() {
           case ResponseType.json:
           case ResponseType.plain:
             expect(response, '');
-            break;
           case ResponseType.stream:
             expect(response, isA<ResponseBody>());
-            break;
           case ResponseType.bytes:
             expect(response, []);
-            break;
-          default:
-            throw AssertionError('Unknown response type: $responseType');
         }
       }
       final jsonResponse = await transformer.transformResponse(
diff --git a/dio_test/lib/src/utils.dart b/dio_test/lib/src/utils.dart
index 10507995e..4dcfe1357 100644
--- a/dio_test/lib/src/utils.dart
+++ b/dio_test/lib/src/utils.dart
@@ -1,6 +1,4 @@
-const _kIsWebInterop = bool.fromEnvironment('dart.library.js_interop');
-const _kIsWebUtil = bool.fromEnvironment('dart.library.js_util');
-const kIsWeb = _kIsWebInterop || _kIsWebUtil || identical(0, 0.0);
+const kIsWeb = bool.fromEnvironment('dart.library.js_interop');
 
 const nonRoutableUrl = 'http://10.0.0.0';
 
diff --git a/dio_test/pubspec.yaml b/dio_test/pubspec.yaml
index 3033b41a9..70ac51812 100644
--- a/dio_test/pubspec.yaml
+++ b/dio_test/pubspec.yaml
@@ -6,7 +6,7 @@ repository: https://github.com/cfug/dio/blob/main/dio_test
 issue_tracker: https://github.com/cfug/dio/issues
 
 environment:
-  sdk: '>=2.18.0 <4.0.0'
+  sdk: ^3.3.0
 
 dependencies:
   dio: any
diff --git a/example_dart/pubspec.yaml b/example_dart/pubspec.yaml
index 3444ece29..095e8ce3f 100644
--- a/example_dart/pubspec.yaml
+++ b/example_dart/pubspec.yaml
@@ -4,7 +4,7 @@ version: 0.0.1
 publish_to: "none"
 
 environment:
-  sdk: ">=3.0.0 <4.0.0"
+  sdk: ^3.3.0
 
 dependencies:
   cookie_jar:
diff --git a/example_flutter_app/pubspec.yaml b/example_flutter_app/pubspec.yaml
index c27b79ce8..537364145 100644
--- a/example_flutter_app/pubspec.yaml
+++ b/example_flutter_app/pubspec.yaml
@@ -3,7 +3,7 @@ description:  Demonstrates how to use the dio package.
 publish_to: 'none'
 
 environment:
-  sdk: ">=2.18.0 <4.0.0"
+  sdk: ^3.3.0
 
 dependencies:
   flutter:
diff --git a/plugins/compatibility_layer/CHANGELOG.md b/plugins/compatibility_layer/CHANGELOG.md
index 1066276c3..adb5654f3 100644
--- a/plugins/compatibility_layer/CHANGELOG.md
+++ b/plugins/compatibility_layer/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## Unreleased
 
-*None.*
+- Bump minimum Dart SDK version to 3.3.0 and simplify web platform check to `dart.library.js_interop`.
 
 ## 0.1.1
 
diff --git a/plugins/compatibility_layer/lib/src/conversion_layer_adapter.dart b/plugins/compatibility_layer/lib/src/conversion_layer_adapter.dart
index 6a951b78f..64a150b45 100644
--- a/plugins/compatibility_layer/lib/src/conversion_layer_adapter.dart
+++ b/plugins/compatibility_layer/lib/src/conversion_layer_adapter.dart
@@ -5,9 +5,7 @@ import 'dart:typed_data';
 import 'package:dio/dio.dart';
 import 'package:http/http.dart' as http;
 
-const _kIsWebInterop = bool.fromEnvironment('dart.library.js_interop');
-const _kIsWebUtil = bool.fromEnvironment('dart.library.js_util');
-const _kIsWeb = _kIsWebInterop || _kIsWebUtil || identical(0, 0.0);
+const _kIsWeb = bool.fromEnvironment('dart.library.js_interop');
 
 /// A conversion layer which translates [Dio] requests to
 /// [`http`](https://pub.dev/packages/http) compatible requests.
diff --git a/plugins/compatibility_layer/pubspec.yaml b/plugins/compatibility_layer/pubspec.yaml
index 3e11e2900..2303c39c3 100644
--- a/plugins/compatibility_layer/pubspec.yaml
+++ b/plugins/compatibility_layer/pubspec.yaml
@@ -13,7 +13,7 @@ repository: https://github.com/cfug/dio/blob/main/plugins/compatibility_layer
 issue_tracker: https://github.com/cfug/dio/issues
 
 environment:
-  sdk: ^3.0.0
+  sdk: ^3.3.0
 
 dependencies:
   dio: ^5.2.0
diff --git a/plugins/cookie_manager/CHANGELOG.md b/plugins/cookie_manager/CHANGELOG.md
index 6eb7913ec..174da8946 100644
--- a/plugins/cookie_manager/CHANGELOG.md
+++ b/plugins/cookie_manager/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## Unreleased
 
-*None.*
+- Bump minimum Dart SDK version to 3.3.0 and simplify web platform check to `dart.library.js_interop`.
 
 ## 3.5.0
 
diff --git a/plugins/cookie_manager/lib/src/cookie_mgr.dart b/plugins/cookie_manager/lib/src/cookie_mgr.dart
index b904d9c1a..dbcb5d655 100644
--- a/plugins/cookie_manager/lib/src/cookie_mgr.dart
+++ b/plugins/cookie_manager/lib/src/cookie_mgr.dart
@@ -6,9 +6,7 @@ import 'package:dio/dio.dart';
 
 import 'exception.dart';
 
-const _kIsWebInterop = bool.fromEnvironment('dart.library.js_interop');
-const _kIsWebUtil = bool.fromEnvironment('dart.library.js_util');
-const _kIsWeb = _kIsWebInterop || _kIsWebUtil || identical(0, 0.0);
+const _kIsWeb = bool.fromEnvironment('dart.library.js_interop');
 
 /// - `(?<=)` is a positive lookbehind assertion that matches a comma (",")
 /// only if it's preceded by a specific pattern. In this case, the lookbehind
diff --git a/plugins/cookie_manager/pubspec.yaml b/plugins/cookie_manager/pubspec.yaml
index 8ba744e60..492a82bc0 100644
--- a/plugins/cookie_manager/pubspec.yaml
+++ b/plugins/cookie_manager/pubspec.yaml
@@ -13,7 +13,7 @@ repository: https://github.com/cfug/dio/blob/main/plugins/cookie_manager
 issue_tracker: https://github.com/cfug/dio/issues
 
 environment:
-  sdk: ">=2.18.0 <4.0.0"
+  sdk: ^3.3.0
 
 dependencies:
   cookie_jar: ^4.0.0
diff --git a/plugins/http2_adapter/CHANGELOG.md b/plugins/http2_adapter/CHANGELOG.md
index b0090b7e9..44a60b33a 100644
--- a/plugins/http2_adapter/CHANGELOG.md
+++ b/plugins/http2_adapter/CHANGELOG.md
@@ -5,7 +5,7 @@ See the [Migration Guide][] for the complete breaking changes list.**
 
 ## Unreleased
 
-*None.*
+- Bump minimum Dart SDK version to 3.3.0.
 
 ## 2.9.0
 
diff --git a/plugins/http2_adapter/pubspec.yaml b/plugins/http2_adapter/pubspec.yaml
index 30f82e82f..fc7e736ea 100644
--- a/plugins/http2_adapter/pubspec.yaml
+++ b/plugins/http2_adapter/pubspec.yaml
@@ -12,7 +12,7 @@ repository: https://github.com/cfug/dio/blob/main/plugins/http2_adapter
 issue_tracker: https://github.com/cfug/dio/issues
 
 environment:
-  sdk: ">=3.0.0 <4.0.0"
+  sdk: ^3.3.0
 
 dependencies:
   dio: ^5.2.0
diff --git a/plugins/native_dio_adapter/example/pubspec.yaml b/plugins/native_dio_adapter/example/pubspec.yaml
index b7c4ff8c3..1c6a0873e 100644
--- a/plugins/native_dio_adapter/example/pubspec.yaml
+++ b/plugins/native_dio_adapter/example/pubspec.yaml
@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: '>=3.1.0 <4.0.0'
+  sdk: ^3.3.0
 
 dependencies:
   flutter:
diff --git a/plugins/web_adapter/CHANGELOG.md b/plugins/web_adapter/CHANGELOG.md
index 57eb537a0..1ff8d0aa2 100644
--- a/plugins/web_adapter/CHANGELOG.md
+++ b/plugins/web_adapter/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## Unreleased
 
-*None.*
+- Update doc comment references from `dart:html` to web implementation.
 
 ## 2.2.2
 
diff --git a/plugins/web_adapter/lib/src/compute_impl.dart b/plugins/web_adapter/lib/src/compute_impl.dart
index 9907d1a13..fd2e059ed 100644
--- a/plugins/web_adapter/lib/src/compute_impl.dart
+++ b/plugins/web_adapter/lib/src/compute_impl.dart
@@ -23,7 +23,7 @@ import 'dart:async';
 
 import 'package:dio/src/compute/compute.dart' as c;
 
-/// The dart:html implementation of [c.compute].
+/// The web implementation of [c.compute].
 Future<R> compute<Q, R>(
   c.ComputeCallback<Q, R> callback,
   Q message, {
diff --git a/pubspec.yaml b/pubspec.yaml
index 693059b47..faec89c56 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -3,7 +3,7 @@ publish_to: 'none'
 repository: https://github.com/cfug/dio
 
 environment:
-  sdk: '>=2.18.0 <4.0.0'
+  sdk: ^3.3.0
 
 dev_dependencies:
   lints: any