diff --git a/tournament/serializers.py b/tournament/serializers.py
index c1aba61..bdfcfb3 100644
--- a/tournament/serializers.py
+++ b/tournament/serializers.py
@@ -15,7 +15,7 @@ class TournamentSerializer(serializers.ModelSerializer):
 		fields = ["name", "nb_players", "nb_players_by_game", "level", "started", "finished", "levels", "id"]
 
 	def get_levels(self, instance: TournamentModel):
-		levels: [[int]] = []
+		levels: list[list[int]] = []
 		for i in range(instance.level):
 			games_id: [int] = instance.get_games_id_by_level(i)
 			if (games_id == []):