diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3f74ccf..3bf2f90 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,7 @@ wheel==0.29.0
 watchdog==0.8.3
 flake8==3.4.1
 tox==2.7.0
-coverage==4.4.1
+coverage==4.5.1
 Sphinx==1.6.3
 cryptography==2.0.3
 PyYAML==3.12