diff --git a/app/database.py b/app/database.py
index 28719e9..0c9c99b 100644
--- a/app/database.py
+++ b/app/database.py
@@ -15,6 +15,7 @@ class Database:
         cursor = self.db.cursor()
         cursor.execute("DELETE FROM sessions WHERE expiry_date <= CURRENT_TIMESTAMP")
         self.db.commit()
+        cursor.close()
 
     def create_session(self, username, password):
         cursor = self.db.cursor()
@@ -28,19 +29,21 @@ class Database:
         uuid = str(uuid4())
         cursor.execute("INSERT INTO sessions (session_id, user_id) VALUES (%s, %s)", (uuid, user_id))
         self.db.commit()
-
+        cursor.close()
         return uuid
 
     def destroy_session(self, uuid):
         cursor = self.db.cursor()
         cursor.execute("DELETE FROM sessions WHERE session_id=%s", (uuid,))
         self.db.commit()
+        cursor.close()
 
     def check_connection(self, uuid):
         cursor = self.db.cursor()
         cursor.execute("SELECT session_id FROM sessions WHERE session_id=%s", (uuid,))
-
-        return cursor.fetchall()
+        result = cursor.fetchall()
+        cursor.close()
+        return result
 
 class User:
     def __init__(self, user_id, username, nom, prenom, creation_date):
@@ -61,6 +64,7 @@ class Session:
         cursor.execute("SELECT utilisateurs.user_id, username, nom, prenom, creation_date FROM utilisateurs "
                        "JOIN sessions ON utilisateurs.user_id=sessions.user_id WHERE session_id=%s", (self.uuid,))
         result = cursor.fetchall()
+        cursor.close()
         return User(*result[0])
 
     def fetch_grades(self):
@@ -70,6 +74,7 @@ class Session:
                        "JOIN matieres ON devoirs.id_matiere=matieres.id_matiere WHERE id_eleve=%s", (self.user.id,))
 
         result = cursor.fetchall()
+        cursor.close()
         dico = {}
         for note in result:
             if note[0] in dico: