diff --git a/setup.py b/setup.py
index e78b389..abd8b8a 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
             'pytest-xdist==3.*',
             'ruff==0.15.12',
             'mypy==1.14.1',
-            'types-pyserial==3.5.0.20240311'
+            'types-pyserial==3.5.0.20260510'
         ],
     },
     entry_points={