diff --git a/setup.py b/setup.py
index 263f043..9cd9947 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
           'test': [
             'pylint==2.8.*',
             'pytest==6.2.*',
-            'pytest-cov==2.12.*',
+            'pytest-cov>=2.12,<5.1',
             'unify==0.5'
           ]
       },