diff --git a/requirements_dev.txt b/requirements_dev.txt
index 5f82f14..2f4e9f2 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==21.3.1; python_version >= '3'
 pip==20.3.4; python_version < '3'
 flake8==4.0.1; python_version >= '3'
 flake8==3.9.2; python_version < '3'
-tox==3.24.5
+tox==4.4.8
 coverage==5.5; python_version < '3'
 coverage==6.2; python_version >= '3'
 Sphinx==4.3.2; python_version >= '3'