diff --git a/requirements_dev.txt b/requirements_dev.txt
index f03b5e9..6733004 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,5 +7,5 @@ coverage==4.5.1
 Sphinx==1.7.2
 PyYAML==3.12
 pytest==3.5.0
-pytest-cov==2.5.1
+pytest-cov==2.6.1
 pytest-runner==4.2