diff --git a/requirements/development.txt b/requirements/development.txt
index 6179ee7..30c6ef8 100644
--- a/requirements/development.txt
+++ b/requirements/development.txt
@@ -12,7 +12,7 @@ pyflakes==2.0.0
 mccabe==0.6.1
 pytest==3.4.0
 pytest-cov==2.5.1
-tox==3.2.1
+tox==4.23.1
 coveralls==1.2.0
 mock==2.0.0