diff --git a/requirements_dev.txt b/requirements_dev.txt
index f3c30aa..ab43b8e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,7 @@ wheel==0.36.2
 watchdog==1.0.2
 flake8==3.8.4
 tox==3.20.1
-coverage==5.3
+coverage==5.3.1
 Sphinx==3.4.1
 cryptography==3.3.1
 PyYAML==5.3.1