diff --git a/lib/page/forum/quiz.dart b/lib/page/forum/quiz.dart
index 28729edd..6172d321 100644
--- a/lib/page/forum/quiz.dart
+++ b/lib/page/forum/quiz.dart
@@ -30,6 +30,7 @@ class OTQuizWidgetState extends State<OTQuizWidget> {
   int questionIndex = 0, prevQuestionIndex = 0;
   int displayIndex = 1, displayTotalIndex = 1;
   late List<QuizQuestion>? questions;
+  late int version;
   late List<int>? indexes;
   List<QuizAnswer>? answers;
   OTQuizDisplayTypes displayType = OTQuizDisplayTypes.WELCOME_PAGE;
@@ -71,8 +72,10 @@ class OTQuizWidgetState extends State<OTQuizWidget> {
               child: PlatformElevatedButton(
                 padding: const EdgeInsets.all(20.0),
                 onPressed: () async {
-                  questions = await ForumRepository.getInstance()
+                  final result = await ForumRepository.getInstance()
                       .getPostRegisterQuestions();
+                  questions = result.$1;
+                  version = result.$2;
                   if (questions != null) {
                     indexes =
                         List.generate(questions!.length, (index) => index);
@@ -182,7 +185,7 @@ class OTQuizWidgetState extends State<OTQuizWidget> {
       return;
     } else {
       final errorList =
-          await ForumRepository.getInstance().submitAnswers(answers!);
+          await ForumRepository.getInstance().submitAnswers(answers!, version);
 
       // Have trouble submitting
       if (errorList == null) {
diff --git a/lib/repository/forum/forum_repository.dart b/lib/repository/forum/forum_repository.dart
index b56afbe1..07e601f3 100644
--- a/lib/repository/forum/forum_repository.dart
+++ b/lib/repository/forum/forum_repository.dart
@@ -833,26 +833,26 @@ class ForumRepository extends BaseRepositoryWithDio {
     return resp.statusCode;
   }
 
-  Future<List<QuizQuestion>?> getPostRegisterQuestions() async {
+  Future<(List<QuizQuestion>?, int)> getPostRegisterQuestions() async {
     final Response<Map<String, dynamic>> response = await dio.get(
         "$_BASE_AUTH_URL/register/questions",
         options: Options(headers: _tokenHeader));
-    final questionList = response.data?["questions"]
+    final List<QuizQuestion>? questionList = response.data?["questions"]
         .map((e) => QuizQuestion.fromJson(e))
-        .toList();
-    final length = response.data?["spec"]["number_of_questions"] as int;
-
-    assert(questionList?.length == length);
-    return questionList.cast<QuizQuestion>();
+        .toList()
+        .cast<QuizQuestion>();
+    final int version = response.data?["version"];
+    return (questionList, version);
   }
 
   // Empty list means all-correct
-  Future<List<int>?> submitAnswers(List<QuizAnswer> answers) async {
+  Future<List<int>?> submitAnswers(
+      List<QuizAnswer> answers, int version) async {
     final Response<Map<String, dynamic>> response = await dio.post(
         "$_BASE_AUTH_URL/register/questions/_answer",
         data: {
           "answers": answers.map((e) => e.toJson()).toList(),
-          "version": 0
+          "version": version
         },
         options: Options(headers: _tokenHeader));
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 703314c4..7535b678 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,10 +1,10 @@
 name: dan_xi
 description: Maybe the best all-rounded service app for Fudan University students.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+publish_to: "none" # Remove this line if you wish to publish to pub.dev
 version: 1.4.4+341
 
 environment:
-  sdk: '>=3.0.0'
+  sdk: ">=3.0.0"
 
 dependencies:
   flutter:
@@ -70,8 +70,8 @@ dependencies:
   file_picker: ^8.0.6
   cached_network_image: ^3.2.1
   flutter_typeahead: ^5.2.0
-  collection: '>=1.15.0 <2.0.0'
-  meta: '>=1.3.0 <2.0.0'
+  collection: ">=1.15.0 <2.0.0"
+  meta: ">=1.3.0 <2.0.0"
   flutter_layout_grid: ^2.0.1
   flutter_js: ^0.8.0
   flutter_math_fork: ^0.7.2