diff --git a/examples/github_search/common_github_search/lib/src/github_cache.dart b/examples/github_search/common_github_search/lib/src/github_cache.dart
index 90fb4264eba..4cbafbba8c1 100644
--- a/examples/github_search/common_github_search/lib/src/github_cache.dart
+++ b/examples/github_search/common_github_search/lib/src/github_cache.dart
@@ -3,7 +3,7 @@ import 'package:common_github_search/common_github_search.dart';
 class GithubCache {
   final _cache = <String, SearchResult>{};
 
-  SearchResult get(String term) => _cache[term];
+  SearchResult? get(String term) => _cache[term];
 
   void set(String term, SearchResult result) => _cache[term] = result;
 
diff --git a/examples/github_search/common_github_search/lib/src/github_client.dart b/examples/github_search/common_github_search/lib/src/github_client.dart
index 0d4511d5bfa..38c3aaa2475 100644
--- a/examples/github_search/common_github_search/lib/src/github_client.dart
+++ b/examples/github_search/common_github_search/lib/src/github_client.dart
@@ -5,14 +5,14 @@ import 'package:http/http.dart' as http;
 import 'package:common_github_search/common_github_search.dart';
 
 class GithubClient {
-  final String baseUrl;
-  final http.Client httpClient;
-
   GithubClient({
-    http.Client httpClient,
+    http.Client? httpClient,
     this.baseUrl = "https://api.github.com/search/repositories?q=",
   }) : this.httpClient = httpClient ?? http.Client();
 
+  final String baseUrl;
+  final http.Client httpClient;
+
   Future<SearchResult> search(String term) async {
     final response = await httpClient.get(Uri.parse("$baseUrl$term"));
     final results = json.decode(response.body);
diff --git a/examples/github_search/common_github_search/lib/src/github_repository.dart b/examples/github_search/common_github_search/lib/src/github_repository.dart
index 21d5ed599f7..faabb5e69d8 100644
--- a/examples/github_search/common_github_search/lib/src/github_repository.dart
+++ b/examples/github_search/common_github_search/lib/src/github_repository.dart
@@ -3,18 +3,18 @@ import 'dart:async';
 import 'package:common_github_search/common_github_search.dart';
 
 class GithubRepository {
+  const GithubRepository(this.cache, this.client);
+
   final GithubCache cache;
   final GithubClient client;
 
-  GithubRepository(this.cache, this.client);
-
   Future<SearchResult> search(String term) async {
-    if (cache.contains(term)) {
-      return cache.get(term);
-    } else {
-      final result = await client.search(term);
-      cache.set(term, result);
-      return result;
+    final cachedResult = cache.get(term);
+    if (cachedResult != null) {
+      return cachedResult;
     }
+    final result = await client.search(term);
+    cache.set(term, result);
+    return result;
   }
 }
diff --git a/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_bloc.dart b/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_bloc.dart
index 1b0c552f371..2cdb510ee80 100644
--- a/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_bloc.dart
+++ b/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_bloc.dart
@@ -1,17 +1,15 @@
 import 'dart:async';
-
-import 'package:meta/meta.dart';
 import 'package:rxdart/rxdart.dart';
 import 'package:bloc/bloc.dart';
 
 import 'package:common_github_search/common_github_search.dart';
 
 class GithubSearchBloc extends Bloc<GithubSearchEvent, GithubSearchState> {
-  final GithubRepository githubRepository;
-
-  GithubSearchBloc({@required this.githubRepository})
+  GithubSearchBloc({required this.githubRepository})
       : super(SearchStateEmpty());
 
+  final GithubRepository githubRepository;
+
   @override
   Stream<Transition<GithubSearchEvent, GithubSearchState>> transformEvents(
     Stream<GithubSearchEvent> events,
@@ -28,13 +26,12 @@ class GithubSearchBloc extends Bloc<GithubSearchEvent, GithubSearchState> {
   @override
   Stream<GithubSearchState> mapEventToState(GithubSearchEvent event) async* {
     if (event is TextChanged) {
-      final String searchTerm = event.text;
+      final searchTerm = event.text;
       if (searchTerm.isEmpty) {
         yield SearchStateEmpty();
       } else {
         yield SearchStateLoading();
         try {
-          await Future<void>.delayed(Duration(seconds: 2));
           final results = await githubRepository.search(searchTerm);
           yield SearchStateSuccess(results.items);
         } catch (error) {
diff --git a/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_event.dart b/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_event.dart
index 6ff3de1b8d2..078834e10e9 100644
--- a/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_event.dart
+++ b/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_event.dart
@@ -5,9 +5,9 @@ abstract class GithubSearchEvent extends Equatable {
 }
 
 class TextChanged extends GithubSearchEvent {
-  final String text;
+  const TextChanged({required this.text});
 
-  const TextChanged({this.text});
+  final String text;
 
   @override
   List<Object> get props => [text];
diff --git a/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_state.dart b/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_state.dart
index f1f3343a239..973882132d4 100644
--- a/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_state.dart
+++ b/examples/github_search/common_github_search/lib/src/github_search_bloc/github_search_state.dart
@@ -14,10 +14,10 @@ class SearchStateEmpty extends GithubSearchState {}
 class SearchStateLoading extends GithubSearchState {}
 
 class SearchStateSuccess extends GithubSearchState {
-  final List<SearchResultItem> items;
-
   const SearchStateSuccess(this.items);
 
+  final List<SearchResultItem> items;
+
   @override
   List<Object> get props => [items];
 
@@ -26,10 +26,10 @@ class SearchStateSuccess extends GithubSearchState {
 }
 
 class SearchStateError extends GithubSearchState {
-  final String error;
-
   const SearchStateError(this.error);
 
+  final String error;
+
   @override
   List<Object> get props => [error];
 }
diff --git a/examples/github_search/common_github_search/lib/src/models/github_user.dart b/examples/github_search/common_github_search/lib/src/models/github_user.dart
index 9d9abe97425..2239c638350 100644
--- a/examples/github_search/common_github_search/lib/src/models/github_user.dart
+++ b/examples/github_search/common_github_search/lib/src/models/github_user.dart
@@ -1,9 +1,9 @@
 class GithubUser {
+  const GithubUser({required this.login, required this.avatarUrl});
+
   final String login;
   final String avatarUrl;
 
-  const GithubUser({this.login, this.avatarUrl});
-
   static GithubUser fromJson(dynamic json) {
     return GithubUser(
       login: json['login'] as String,
diff --git a/examples/github_search/common_github_search/lib/src/models/search_result.dart b/examples/github_search/common_github_search/lib/src/models/search_result.dart
index f7ed1b46752..c816beacd27 100644
--- a/examples/github_search/common_github_search/lib/src/models/search_result.dart
+++ b/examples/github_search/common_github_search/lib/src/models/search_result.dart
@@ -1,9 +1,9 @@
 import 'package:common_github_search/common_github_search.dart';
 
 class SearchResult {
-  final List<SearchResultItem> items;
+  const SearchResult({required this.items});
 
-  const SearchResult({this.items});
+  final List<SearchResultItem> items;
 
   static SearchResult fromJson(Map<String, dynamic> json) {
     final items = (json['items'] as List<dynamic>)
diff --git a/examples/github_search/common_github_search/lib/src/models/search_result_error.dart b/examples/github_search/common_github_search/lib/src/models/search_result_error.dart
index 60f550bb3fd..47edfab1941 100644
--- a/examples/github_search/common_github_search/lib/src/models/search_result_error.dart
+++ b/examples/github_search/common_github_search/lib/src/models/search_result_error.dart
@@ -1,7 +1,7 @@
 class SearchResultError {
-  final String message;
+  const SearchResultError({required this.message});
 
-  const SearchResultError({this.message});
+  final String message;
 
   static SearchResultError fromJson(dynamic json) {
     return SearchResultError(
diff --git a/examples/github_search/common_github_search/lib/src/models/search_result_item.dart b/examples/github_search/common_github_search/lib/src/models/search_result_item.dart
index 2c958fd5e56..ddc085fe1c5 100644
--- a/examples/github_search/common_github_search/lib/src/models/search_result_item.dart
+++ b/examples/github_search/common_github_search/lib/src/models/search_result_item.dart
@@ -1,12 +1,16 @@
 import 'package:common_github_search/common_github_search.dart';
 
 class SearchResultItem {
+  const SearchResultItem({
+    required this.fullName,
+    required this.htmlUrl,
+    required this.owner,
+  });
+
   final String fullName;
   final String htmlUrl;
   final GithubUser owner;
 
-  const SearchResultItem({this.fullName, this.htmlUrl, this.owner});
-
   static SearchResultItem fromJson(dynamic json) {
     return SearchResultItem(
       fullName: json['full_name'] as String,
diff --git a/examples/github_search/common_github_search/pubspec.yaml b/examples/github_search/common_github_search/pubspec.yaml
index c9ed88d083c..a207b42e9c0 100644
--- a/examples/github_search/common_github_search/pubspec.yaml
+++ b/examples/github_search/common_github_search/pubspec.yaml
@@ -4,12 +4,11 @@ version: 1.0.0+1
 publish_to: none
 
 environment:
-  sdk: ">=2.6.0 <3.0.0"
+  sdk: ">=2.12.0-0 <3.0.0"
 
 dependencies:
-  meta: ^1.1.8
   bloc:
     path: ../../../packages/bloc
-  equatable: ^1.2.5
-  http: ^0.12.0
-  rxdart: ^0.24.0
+  equatable: ^2.0.0-nullsafety.3
+  http: ^0.13.0
+  rxdart: ^0.26.0-nullsafety.1
diff --git a/examples/github_search/flutter_github_search/ios/Flutter/Debug.xcconfig b/examples/github_search/flutter_github_search/ios/Flutter/Debug.xcconfig
index e8efba11468..b2f5fae9c25 100644
--- a/examples/github_search/flutter_github_search/ios/Flutter/Debug.xcconfig
+++ b/examples/github_search/flutter_github_search/ios/Flutter/Debug.xcconfig
@@ -1,2 +1,3 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Generated.xcconfig"
diff --git a/examples/github_search/flutter_github_search/ios/Flutter/Release.xcconfig b/examples/github_search/flutter_github_search/ios/Flutter/Release.xcconfig
index 399e9340e6f..88c29144c83 100644
--- a/examples/github_search/flutter_github_search/ios/Flutter/Release.xcconfig
+++ b/examples/github_search/flutter_github_search/ios/Flutter/Release.xcconfig
@@ -1,2 +1,3 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Generated.xcconfig"
diff --git a/examples/github_search/flutter_github_search/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/examples/github_search/flutter_github_search/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
index 1d526a16ed0..919434a6254 100644
--- a/examples/github_search/flutter_github_search/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ b/examples/github_search/flutter_github_search/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -2,6 +2,6 @@
 <Workspace
    version = "1.0">
    <FileRef
-      location = "group:Runner.xcodeproj">
+      location = "self:">
    </FileRef>
 </Workspace>
diff --git a/examples/github_search/flutter_github_search/lib/main.dart b/examples/github_search/flutter_github_search/lib/main.dart
index e423a2cba1b..bfca38ece97 100644
--- a/examples/github_search/flutter_github_search/lib/main.dart
+++ b/examples/github_search/flutter_github_search/lib/main.dart
@@ -1,6 +1,4 @@
 import 'package:flutter/material.dart';
-
-import 'package:meta/meta.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:common_github_search/common_github_search.dart';
 import 'package:flutter_github_search/search_form.dart';
@@ -15,13 +13,13 @@ void main() {
 }
 
 class App extends StatelessWidget {
-  final GithubRepository githubRepository;
-
   const App({
-    Key key,
-    @required this.githubRepository,
+    Key? key,
+    required this.githubRepository,
   }) : super(key: key);
 
+  final GithubRepository githubRepository;
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
diff --git a/examples/github_search/flutter_github_search/lib/search_form.dart b/examples/github_search/flutter_github_search/lib/search_form.dart
index feab1b3a402..b2ffc30750a 100644
--- a/examples/github_search/flutter_github_search/lib/search_form.dart
+++ b/examples/github_search/flutter_github_search/lib/search_form.dart
@@ -8,7 +8,10 @@ class SearchForm extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Column(
-      children: <Widget>[_SearchBar(), _SearchBody()],
+      children: <Widget>[
+        _SearchBar(),
+        _SearchBody(),
+      ],
     );
   }
 }
@@ -20,12 +23,12 @@ class _SearchBar extends StatefulWidget {
 
 class _SearchBarState extends State<_SearchBar> {
   final _textController = TextEditingController();
-  GithubSearchBloc _githubSearchBloc;
+  late GithubSearchBloc _githubSearchBloc;
 
   @override
   void initState() {
     super.initState();
-    _githubSearchBloc = BlocProvider.of<GithubSearchBloc>(context);
+    _githubSearchBloc = context.read<GithubSearchBloc>();
   }
 
   @override
@@ -85,9 +88,9 @@ class _SearchBody extends StatelessWidget {
 }
 
 class _SearchResults extends StatelessWidget {
-  final List<SearchResultItem> items;
+  const _SearchResults({Key? key, required this.items}) : super(key: key);
 
-  const _SearchResults({Key key, this.items}) : super(key: key);
+  final List<SearchResultItem> items;
 
   @override
   Widget build(BuildContext context) {
@@ -101,9 +104,9 @@ class _SearchResults extends StatelessWidget {
 }
 
 class _SearchResultItem extends StatelessWidget {
-  final SearchResultItem item;
+  const _SearchResultItem({Key? key, required this.item}) : super(key: key);
 
-  const _SearchResultItem({Key key, @required this.item}) : super(key: key);
+  final SearchResultItem item;
 
   @override
   Widget build(BuildContext context) {
diff --git a/examples/github_search/flutter_github_search/pubspec.yaml b/examples/github_search/flutter_github_search/pubspec.yaml
index 56d618221a0..7d2ee31924e 100644
--- a/examples/github_search/flutter_github_search/pubspec.yaml
+++ b/examples/github_search/flutter_github_search/pubspec.yaml
@@ -4,7 +4,7 @@ version: 1.0.0+1
 publish_to: none
 
 environment:
-  sdk: ">=2.6.0 <3.0.0"
+  sdk: ">=2.12.0-0 <3.0.0"
 
 dependencies:
   flutter:
@@ -13,7 +13,7 @@ dependencies:
     path: ../../../packages/bloc
   flutter_bloc:
     path: ../../../packages/flutter_bloc
-  url_launcher: ^5.4.1
+  url_launcher: ^6.0.0-nullsafety.6
   common_github_search:
     path: ../common_github_search