diff --git a/src/main/java/fr/univ_lille/gitlab/classrooms/quiz/QuizScore.java b/src/main/java/fr/univ_lille/gitlab/classrooms/quiz/QuizScore.java
index cc3106c..515f529 100644
--- a/src/main/java/fr/univ_lille/gitlab/classrooms/quiz/QuizScore.java
+++ b/src/main/java/fr/univ_lille/gitlab/classrooms/quiz/QuizScore.java
@@ -38,7 +38,7 @@ public class QuizScore {
     @Id
     String studentId;
 
-    long submissionCount = 1;
+    int submissionCount = 1;
 
     ZonedDateTime submissionDate = ZonedDateTime.now();
 
@@ -70,11 +70,11 @@ public class QuizScore {
         this.score = score;
     }
 
-    public long getSubmissionCount() {
+    public int getSubmissionCount() {
         return submissionCount;
     }
 
-    public void setSubmissionCount(long submissionCount) {
+    public void setSubmissionCount(int submissionCount) {
         this.submissionCount = submissionCount;
     }
 
diff --git a/src/main/resources/db/migration/V5__QUIZ_SCORE_new_columns.sql b/src/main/resources/db/migration/V5__QUIZ_SCORE_new_columns.sql
new file mode 100644
index 0000000..ee4dd4b
--- /dev/null
+++ b/src/main/resources/db/migration/V5__QUIZ_SCORE_new_columns.sql
@@ -0,0 +1,14 @@
+alter table quiz_score
+    alter column score type bigint;
+
+alter table quiz_score
+    add column max_score bigint;
+
+alter table quiz_score
+    add column submission_count int;
+
+alter table quiz_score
+    add column submission_date timestamp with time zone;
+
+alter table quiz_score
+    drop column submitted_at;