diff --git a/dev-requirements.txt b/dev-requirements.txt
index b93aeeb3..6528dc1a 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -11,7 +11,7 @@ pytest-mock
 watchdog
 mypy
 isort
-tox==3.24.3
+tox==3.28.0
 coverage
 wily
 rope