diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 0b1fbec..bc92f23 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml
@@ -47,7 +47,7 @@ jobs:
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest]
-        sdk: [3.1.0, dev]
+        sdk: [3.2.0, dev]
     steps:
       - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
       - uses: dart-lang/setup-dart@8a4b97ea2017cc079571daec46542f76189836b1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36822cf..3e9247d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## 4.1.3-dev
 
-- Update the minimum Dart SDK version to `3.1.0`.
+- Update the minimum Dart SDK version to `3.2.0`.
 
 ## 4.1.2
 
diff --git a/lib/client/sse_client.dart b/lib/client/sse_client.dart
index 86dac10..5cf2511 100644
--- a/lib/client/sse_client.dart
+++ b/lib/client/sse_client.dart
@@ -4,12 +4,12 @@
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:html';
+import 'dart:js_interop';
 
-import 'package:js/js.dart';
 import 'package:logging/logging.dart';
 import 'package:pool/pool.dart';
 import 'package:stream_channel/stream_channel.dart';
+import 'package:web/helpers.dart';
 
 import '../src/util/uuid.dart';
 
@@ -52,14 +52,15 @@ class SseClient extends StreamChannelMixin<String?> {
             ? generateUuidV4()
             : '$debugKey-${generateUuidV4()}' {
     _serverUrl = '$serverUrl?sseClientId=$_clientId';
-    _eventSource = EventSource(_serverUrl, withCredentials: true);
+    _eventSource =
+        EventSource(_serverUrl, EventSourceInit(withCredentials: true));
     _eventSource.onOpen.first.whenComplete(() {
       _onConnected.complete();
       _outgoingController.stream
           .listen(_onOutgoingMessage, onDone: _onOutgoingDone);
     });
-    _eventSource.addEventListener('message', _onIncomingMessage);
-    _eventSource.addEventListener('control', _onIncomingControlMessage);
+    _eventSource.addEventListener('message', _onIncomingMessage.toJS);
+    _eventSource.addEventListener('control', _onIncomingControlMessage.toJS);
 
     _eventSource.onOpen.listen((_) {
       _errorTimer?.cancel();
@@ -114,7 +115,7 @@ class SseClient extends StreamChannelMixin<String?> {
 
   void _onIncomingControlMessage(Event message) {
     var data = (message as MessageEvent).data;
-    if (data == 'close') {
+    if (data.dartify() == 'close') {
       close();
     } else {
       throw UnsupportedError('[$_clientId] Illegal Control Message "$data"');
@@ -147,8 +148,10 @@ class SseClient extends StreamChannelMixin<String?> {
         final url = '$_serverUrl&messageId=${++_lastMessageId}';
         await _fetch(
             url,
-            _FetchOptions(
-                method: 'POST', body: encodedMessage, credentials: 'include'));
+            RequestInit(
+                method: 'POST',
+                body: encodedMessage.jsify(),
+                credentials: 'include'));
       } catch (error) {
         final augmentedError =
             '[$_clientId] SSE client failed to send $message:\n $error';
@@ -159,20 +162,5 @@ class SseClient extends StreamChannelMixin<String?> {
   }
 }
 
-// Custom implementation of Fetch API until Dart supports GET vs. POST,
-// credentials, etc. See https://github.com/dart-lang/http/issues/595.
-@JS('fetch')
-external Object _nativeJsFetch(String resourceUrl, _FetchOptions options);
-
-Future<dynamic> _fetch(String resourceUrl, _FetchOptions options) =>
-    promiseToFuture(_nativeJsFetch(resourceUrl, options));
-
-@JS()
-@anonymous
-class _FetchOptions {
-  external factory _FetchOptions({
-    required String method, // e.g., 'GET', 'POST'
-    required String credentials, // e.g., 'omit', 'same-origin', 'include'
-    required String? body,
-  });
-}
+Future<dynamic> _fetch(String resourceUrl, RequestInit options) =>
+    window.fetch(resourceUrl.toJS, options).toDart;
diff --git a/lib/src/server/sse_handler.dart b/lib/src/server/sse_handler.dart
index d4b7e06..c235c20 100644
--- a/lib/src/server/sse_handler.dart
+++ b/lib/src/server/sse_handler.dart
@@ -158,7 +158,7 @@ class SseConnection extends StreamChannelMixin<String?> {
       // period.
       // If the connection comes back, this will be cancelled and all messages
       // left in the queue tried again.
-      _keepAliveTimer = Timer(_keepAlive!, _close);
+      _keepAliveTimer = Timer(_keepAlive, _close);
     }
   }
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 1258266..900d710 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -7,7 +7,7 @@ description: >-
 repository: https://github.com/dart-lang/sse
 
 environment:
-  sdk: ^3.1.0
+  sdk: ^3.2.0-beta
 
 dependencies:
   async: ^2.0.8
@@ -17,6 +17,7 @@ dependencies:
   pool: ^1.5.0
   shelf: ^1.1.0
   stream_channel: ^2.0.0
+  web: ^0.3.0
 
 dev_dependencies:
   dart_flutter_team_lints: ^2.0.0