diff --git a/requirements_dev.txt b/requirements_dev.txt
index 96c3452..5cc7a12 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,6 +3,6 @@
 -r requirements_mypy.txt
 -r requirements_pypi.txt
 -r requirements_test.txt
-tox==3.24.1
+tox==4.3.5
 
 -e .