diff --git a/setup.py b/setup.py
index 214729b..0d1cc5c 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
             'pytest-cov>=4,<5',
             'pytest-asyncio==0.*',
             'pytest-xdist==3.*',
-            'mypy==1.8.0',
+            'mypy==1.9.0',
             'types-pyserial',
             'ruff==0.3.0',
         ],