diff --git a/requirements.txt b/requirements.txt
index f28f090..934c1b6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 flask>=3.0,<4.0
 sqlalchemy>=2.0,<3.0
 python-dotenv>=1.0,<2.0
-marshmallow>=3.22,<4.0
+marshmallow>=4.3.0,<5.0
 flask-limiter>=3.8,<4.0
 
 # Production server