diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1294648..b21b2f6 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,5 +8,5 @@ flake8-mutable==1.2.0
 Sphinx==1.7.6
 pytest==3.7.1
 pytest-runner==4.2
-pytest-cov==2.5.1
+pytest-cov==2.6.0
 mypy==0.620; python_version >= '3.4'