diff --git a/setup.py b/setup.py
index 16a31ff..a4bef72 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
           'test': [
               'pylint==2.8.*',
               'pytest==6.2.*',
-              'pytest-cov==2.12.*',
+              'pytest-cov>=2.12,<5.1',
           ]
       },
       python_requires='>=3.6',