diff --git a/requirements_dev.txt b/requirements_dev.txt
index faeb3b1..663cf6c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,7 @@ docker==4.0.1
 wheel==0.31.1
 watchdog==0.9.0
 flake8==3.7.7
-tox==3.4.0
+tox==3.16.0
 coverage==4.5.3
 Sphinx==1.8.0
 pygments==2.2.0