diff --git a/requirements_dev.txt b/requirements_dev.txt
index f228b3f08..6f5ebd3d7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,5 +1,5 @@
 pytest==8.1.1
-tox==4.14.2
+tox==4.21.2
 cookiecutter>=2.6.0
 pytest-cookies==0.7.0
 alabaster==0.7.16
diff --git a/{{cookiecutter.project_slug}}/requirements_dev.txt b/{{cookiecutter.project_slug}}/requirements_dev.txt
index f63d7da3c..fe069d5ad 100644
--- a/{{cookiecutter.project_slug}}/requirements_dev.txt
+++ b/{{cookiecutter.project_slug}}/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==19.2.3
 bump2version==0.5.11
 wheel==0.33.6
 watchdog==0.9.0
-tox==3.14.0
+tox==4.21.2
 coverage==4.5.4
 Sphinx==7.2.6
 twine==5.0.0