diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index 5fb5a1c7..2d725e23 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -13,7 +13,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         # Test with at least the declared minimum Dart version
-        sdk: [2.18.7, stable]
+        sdk: ['3.0', stable]
     steps:
       - uses: actions/checkout@v4
       - uses: dart-lang/setup-dart@v1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9665e6e4..ea5c0870 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 9.23.0
+
+* Require Dart 3.0.
+* Update to the latest `package:lints`.
+
 ## 9.22.0
 
 * Add support for the `Ghost` user when the Github user is deleted.
diff --git a/analysis_options.yaml b/analysis_options.yaml
index f7a9ff49..1af8628e 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -15,8 +15,6 @@ linter:
     - avoid_implementing_value_types
     - avoid_js_rounded_ints
     - avoid_private_typedef_functions
-    - avoid_returning_null
-    - avoid_returning_null_for_future
     - avoid_returning_this
     - avoid_setters_without_getters
     - avoid_slow_async_io
diff --git a/lib/src/common.dart b/lib/src/common.dart
index 8ec0f7ae..df783a26 100644
--- a/lib/src/common.dart
+++ b/lib/src/common.dart
@@ -1,5 +1,7 @@
 /// The Core of GitHub for Dart.
 /// Contains the Models and other GitHub stuff.
+library;
+
 export 'package:github/src/common/activity_service.dart';
 export 'package:github/src/common/authorizations_service.dart';
 export 'package:github/src/common/checks_service.dart';
diff --git a/lib/src/common/activity_service.dart b/lib/src/common/activity_service.dart
index 0001fcdc..f69e8c49 100644
--- a/lib/src/common/activity_service.dart
+++ b/lib/src/common/activity_service.dart
@@ -9,7 +9,7 @@ import 'package:http/http.dart' as http;
 ///
 /// API docs: https://developer.github.com/v3/activity/
 class ActivityService extends Service {
-  ActivityService(GitHub github) : super(github);
+  ActivityService(super.github);
 
   /// Lists public events.
   ///
diff --git a/lib/src/common/authorizations_service.dart b/lib/src/common/authorizations_service.dart
index 3cbe6ef0..68b80c25 100644
--- a/lib/src/common/authorizations_service.dart
+++ b/lib/src/common/authorizations_service.dart
@@ -10,7 +10,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://developer.github.com/v3/oauth_authorizations/
 class AuthorizationsService extends Service {
-  AuthorizationsService(GitHub github) : super(github);
+  AuthorizationsService(super.github);
 
   /// Lists all authorizations.
   ///
diff --git a/lib/src/common/checks_service.dart b/lib/src/common/checks_service.dart
index 0e87f4d2..f3085197 100644
--- a/lib/src/common/checks_service.dart
+++ b/lib/src/common/checks_service.dart
@@ -18,14 +18,13 @@ class ChecksService extends Service {
   /// API docs: https://developer.github.com/v3/checks/suites/
   final CheckSuitesService checkSuites;
 
-  ChecksService(GitHub github)
+  ChecksService(super.github)
       : checkRuns = CheckRunsService._(github),
-        checkSuites = CheckSuitesService._(github),
-        super(github);
+        checkSuites = CheckSuitesService._(github);
 }
 
 class CheckRunsService extends Service {
-  CheckRunsService._(GitHub github) : super(github);
+  CheckRunsService._(super.github);
 
   /// Creates a new check run for a specific commit in a repository.
   /// Your GitHub App must have the `checks:write` permission to create check runs.
@@ -235,7 +234,7 @@ class CheckRunsService extends Service {
 }
 
 class CheckSuitesService extends Service {
-  CheckSuitesService._(GitHub github) : super(github);
+  CheckSuitesService._(super.github);
 
   /// Gets a single check suite using its `id`.
   /// GitHub Apps must have the `checks:read` permission on a private repository or pull access to a public repository to get check suites.
diff --git a/lib/src/common/gists_service.dart b/lib/src/common/gists_service.dart
index 9078e03d..05ac62bd 100644
--- a/lib/src/common/gists_service.dart
+++ b/lib/src/common/gists_service.dart
@@ -8,7 +8,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://developer.github.com/v3/gists/
 class GistsService extends Service {
-  GistsService(GitHub github) : super(github);
+  GistsService(super.github);
 
   /// lists gists for a user.
   ///
diff --git a/lib/src/common/git_service.dart b/lib/src/common/git_service.dart
index 7052e4f6..338dbeba 100644
--- a/lib/src/common/git_service.dart
+++ b/lib/src/common/git_service.dart
@@ -8,7 +8,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://developer.github.com/v3/git/blobs/
 class GitService extends Service {
-  const GitService(GitHub github) : super(github);
+  const GitService(super.github);
 
   /// Fetches a blob from [slug] for a given [sha].
   ///
diff --git a/lib/src/common/issues_service.dart b/lib/src/common/issues_service.dart
index 243c81dd..ed061846 100644
--- a/lib/src/common/issues_service.dart
+++ b/lib/src/common/issues_service.dart
@@ -8,7 +8,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://developer.github.com/v3/issues/
 class IssuesService extends Service {
-  IssuesService(GitHub github) : super(github);
+  IssuesService(super.github);
 
   /// List all issues across all the authenticated user’s visible repositories
   /// including owned repositories, member repositories, and organization repositories
diff --git a/lib/src/common/misc_service.dart b/lib/src/common/misc_service.dart
index bb351f3d..30385a18 100644
--- a/lib/src/common/misc_service.dart
+++ b/lib/src/common/misc_service.dart
@@ -7,7 +7,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://developer.github.com/v3/misc/
 class MiscService extends Service {
-  MiscService(GitHub github) : super(github);
+  MiscService(super.github);
 
   /// Fetches all emojis available on GitHub
   /// Returns a map of the name to a url of the image.
diff --git a/lib/src/common/model/checks.dart b/lib/src/common/model/checks.dart
index 9d7d6e21..5068febc 100644
--- a/lib/src/common/model/checks.dart
+++ b/lib/src/common/model/checks.dart
@@ -9,7 +9,7 @@ class CheckRunAnnotationLevel extends EnumWithValue {
   static const warning = CheckRunAnnotationLevel._('warning');
   static const failure = CheckRunAnnotationLevel._('failure');
 
-  const CheckRunAnnotationLevel._(String value) : super(value);
+  const CheckRunAnnotationLevel._(String super.value);
 
   factory CheckRunAnnotationLevel._fromValue(String? value) {
     switch (value) {
@@ -51,7 +51,7 @@ class CheckRunConclusion extends EnumWithValue {
   static const actionRequired = CheckRunConclusion._('action_required');
   static const empty = CheckRunConclusion._(null);
 
-  const CheckRunConclusion._(String? value) : super(value);
+  const CheckRunConclusion._(super.value);
 
   factory CheckRunConclusion._fromValue(String? value) {
     if (value == null) {
@@ -79,13 +79,13 @@ class CheckRunStatus extends EnumWithValue {
   static const queued = CheckRunStatus._('queued');
   static const inProgress = CheckRunStatus._('in_progress');
   static const completed = CheckRunStatus._('completed');
-  const CheckRunStatus._(String value) : super(value);
+  const CheckRunStatus._(String super.value);
 }
 
 class CheckRunFilter extends EnumWithValue {
   static const all = CheckRunFilter._('all');
   static const latest = CheckRunFilter._('latest');
-  const CheckRunFilter._(String value) : super(value);
+  const CheckRunFilter._(String super.value);
 }
 
 @immutable
@@ -253,7 +253,7 @@ class CheckRunAnnotation {
         assert(title.length <= 255);
 
   @override
-  bool operator ==(dynamic other) {
+  bool operator ==(Object other) {
     if (other is CheckRunAnnotation) {
       return other.annotationLevel == annotationLevel &&
           other.path == path &&
diff --git a/lib/src/common/orgs_service.dart b/lib/src/common/orgs_service.dart
index d793a8b9..b2ca7b26 100644
--- a/lib/src/common/orgs_service.dart
+++ b/lib/src/common/orgs_service.dart
@@ -9,7 +9,7 @@ import 'package:http/http.dart' as http;
 ///
 /// API docs: https://developer.github.com/v3/orgs/
 class OrganizationsService extends Service {
-  OrganizationsService(GitHub github) : super(github);
+  OrganizationsService(super.github);
 
   /// Lists all of the memberships in organizations for the given [userName].
   /// If [userName] is not specified we list the memberships in organizations
diff --git a/lib/src/common/pulls_service.dart b/lib/src/common/pulls_service.dart
index 5242f0e3..7fee2bf9 100644
--- a/lib/src/common/pulls_service.dart
+++ b/lib/src/common/pulls_service.dart
@@ -8,7 +8,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://developer.github.com/v3/pulls/
 class PullRequestsService extends Service {
-  PullRequestsService(GitHub github) : super(github);
+  PullRequestsService(super.github);
 
   /// Fetches several pull requests.
   ///
diff --git a/lib/src/common/repos_service.dart b/lib/src/common/repos_service.dart
index a274710e..83fa5ef0 100644
--- a/lib/src/common/repos_service.dart
+++ b/lib/src/common/repos_service.dart
@@ -9,7 +9,7 @@ import 'package:http/http.dart' as http;
 ///
 /// API docs: https://developer.github.com/v3/repos/
 class RepositoriesService extends Service {
-  RepositoriesService(GitHub github) : super(github);
+  RepositoriesService(super.github);
 
   /// Lists the repositories of the currently authenticated user.
   ///
diff --git a/lib/src/common/search_service.dart b/lib/src/common/search_service.dart
index bf2b41ec..27cf6eef 100644
--- a/lib/src/common/search_service.dart
+++ b/lib/src/common/search_service.dart
@@ -8,7 +8,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://developer.github.com/v3/search/
 class SearchService extends Service {
-  SearchService(GitHub github) : super(github);
+  SearchService(super.github);
 
   /// Search for repositories using [query].
   /// Since the Search Rate Limit is small, this is a best effort implementation.
diff --git a/lib/src/common/url_shortener_service.dart b/lib/src/common/url_shortener_service.dart
index 0b1e296f..60db2958 100644
--- a/lib/src/common/url_shortener_service.dart
+++ b/lib/src/common/url_shortener_service.dart
@@ -6,7 +6,7 @@ import 'package:github/src/common.dart';
 ///
 /// API docs: https://github.com/blog/985-git-io-github-url-shortener
 class UrlShortenerService extends Service {
-  UrlShortenerService(GitHub github) : super(github);
+  UrlShortenerService(super.github);
 
   /// Shortens the provided [url]. An optional [code] can be provided to create
   /// your own vanity URL.
diff --git a/lib/src/common/users_service.dart b/lib/src/common/users_service.dart
index bb27ff6d..6485f4b0 100644
--- a/lib/src/common/users_service.dart
+++ b/lib/src/common/users_service.dart
@@ -8,7 +8,7 @@ import 'package:http/http.dart' as http;
 ///
 /// API docs: https://developer.github.com/v3/users/
 class UsersService extends Service {
-  UsersService(GitHub github) : super(github);
+  UsersService(super.github);
 
   /// Fetches the user specified by [name].
   ///
diff --git a/lib/src/common/util/errors.dart b/lib/src/common/util/errors.dart
index 81fa72b2..14625a6c 100644
--- a/lib/src/common/util/errors.dart
+++ b/lib/src/common/util/errors.dart
@@ -25,14 +25,13 @@ class NotReady extends GitHubError {
 /// GitHub Entity was not found
 class NotFound extends GitHubError {
   const NotFound(
-    GitHub github,
-    String msg,
-  ) : super(github, msg);
+    super.github,
+    String super.msg,
+  );
 }
 
 class BadRequest extends GitHubError {
-  const BadRequest(GitHub github, [String? msg = 'Not Found'])
-      : super(github, msg);
+  const BadRequest(super.github, [super.msg = 'Not Found']);
 }
 
 /// GitHub Repository was not found
@@ -94,11 +93,10 @@ class NotAuthenticated extends GitHubError {
 }
 
 class InvalidJSON extends BadRequest {
-  const InvalidJSON(GitHub github, [String? message = 'Invalid JSON'])
-      : super(github, message);
+  const InvalidJSON(super.github, [super.message = 'Invalid JSON']);
 }
 
 class ValidationFailed extends GitHubError {
-  const ValidationFailed(GitHub github, [String message = 'Validation Failed'])
-      : super(github, message);
+  const ValidationFailed(super.github,
+      [String super.message = 'Validation Failed']);
 }
diff --git a/lib/src/common/util/utils.dart b/lib/src/common/util/utils.dart
index 57bd6712..5c690774 100644
--- a/lib/src/common/util/utils.dart
+++ b/lib/src/common/util/utils.dart
@@ -21,7 +21,7 @@ abstract class EnumWithValue {
 
   /// True iff [other] is an [EnumWithValue] with the same value as this object.
   @override
-  bool operator ==(dynamic other) =>
+  bool operator ==(Object other) =>
       other is EnumWithValue && value == other.value;
 
   @override
diff --git a/pubspec.yaml b/pubspec.yaml
index af2ff765..308c3631 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,10 +1,10 @@
 name: github
-version: 9.22.0
+version: 9.23.0
 description: A high-level GitHub API Client Library that uses Github's v3 API
 homepage: https://github.com/SpinlockLabs/github.dart
 
 environment:
-  sdk: '>=2.18.0 <3.0.0'
+  sdk: ^3.0.0
 
 dependencies:
   http: '>=0.13.0 <2.0.0'
@@ -19,10 +19,10 @@ dev_dependencies:
   collection: ^1.15.0
   dependency_validator:
   json_serializable: ^6.6.1
-  lints: ^2.0.0
+  lints: ^3.0.0
   mockito: ^5.0.0
   nock: ^1.0.0
   pub_semver: ^2.0.0
   test: ^1.16.0
   yaml: ^3.0.0
-  yaml_edit: 
+  yaml_edit: ^2.2.0
diff --git a/test/helper/http.dart b/test/helper/http.dart
index 2c5eaab4..ffed40d4 100644
--- a/test/helper/http.dart
+++ b/test/helper/http.dart
@@ -25,8 +25,8 @@ class MockHTTPClient extends http.BaseClient {
 }
 
 class MockResponse extends http.Response {
-  MockResponse(String body, Map<String, String> headers, int statusCode)
-      : super(body, statusCode, headers: headers);
+  MockResponse(super.body, Map<String, String> headers, super.statusCode)
+      : super(headers: headers);
 
   factory MockResponse.fromAsset(String name) {
     final responseData =
diff --git a/test/server/hooks_test_data.dart b/test/server/hooks_test_data.dart
index 4f5b734b..ad02cc10 100644
--- a/test/server/hooks_test_data.dart
+++ b/test/server/hooks_test_data.dart
@@ -1,4 +1,5 @@
 /// Json messages as dart string used for checks model tests.
+library;
 
 String checkSuiteString = checkSuiteTemplate('requested');
 
diff --git a/tool/process_github_schema.dart b/tool/process_github_schema.dart
index e3850df5..14994289 100644
--- a/tool/process_github_schema.dart
+++ b/tool/process_github_schema.dart
@@ -20,7 +20,7 @@ List<String> wordWrap(String body) {
 
 typedef GenTypeVisitor = void Function(GenType type);
 
-abstract class GenType extends Comparable<GenType> {
+abstract class GenType implements Comparable<GenType> {
   GenType();
 
   String get name;