diff --git a/requirements_dev.txt b/requirements_dev.txt
index 23de1aa..4e72226 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==2.1.3
 twine==3.1.1
 flake8==3.9.2
 coverage==5.1
-tox==3.24.4
+tox==4.14.0
 Sphinx==4.0.2
 pytest==6.2.3
 pytest-runner==5.3.1