diff --git a/requirements_dev.txt b/requirements_dev.txt
index 491145a..bf85097 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ pytest==5.2.1
 pytest-runner==5.1
 pytz==2019.3
 PyYAML==5.1.2
-tox==3.14.0
+tox==4.14.0
 tox-pyenv==1.1.0
 watchdog==0.9.0
 wheel==0.33.6