diff --git a/setup.py b/setup.py
index 73ac6b0..30c1ed1 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
         'test': [
             'mypy==1.13.0',
             'pytest>=8,<9',
-            'pytest-cov>=5,<6',
+            'pytest-cov>=6,<7',
             'pytest-asyncio==0.*',
             'ruff==0.5.5',
             'types-pyserial',