diff --git a/backend/requirements.txt b/backend/requirements.txt
index 39f47394..0c897326 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -7,7 +7,7 @@ Flask-RESTful
 flask_cors
 Flask-SocketIO>=5.3,<6.0
 gunicorn
-marshmallow>=3.0,<4.0
+marshmallow>=4.3.0,<5.0
 flask_marshmallow
 marshmallow_sqlalchemy
 flask_sqlalchemy