diff --git a/setup.py b/setup.py
index 581936a..68a6f2e 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ def get_version(rel_path):
     extras_require={
         'test': [
             'pytest>=5,<7',
-            'pytest-cov>=2,<4',
+            'pytest-cov>=2,<5',
             'nose==1.*,>=1.3.7',
             'nbval==0.9.*,>=0.9.6',
         ],