diff --git a/requirements_dev.txt b/requirements_dev.txt
index 9ee8642..88490b7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,7 @@ wheel==0.33.6
 watchdog==0.9.0
 flake8==3.7.9
 black==19.10b0
-tox==3.14.2
+tox==3.22.0
 coverage==4.5.4
 Sphinx==2.2.2
 twine==3.1.1