diff --git a/requirements_dev.txt b/requirements_dev.txt
index c973431..46e7d24 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -10,4 +10,4 @@ Sphinx==3.1.2
 
 pytest==4.5.0
 pytest-runner==5.2
-pytest-cov==2.7.1
+pytest-cov==4.0.0