diff --git a/requirements_dev.txt b/requirements_dev.txt
index b890571..bea06dc 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -9,7 +9,7 @@ pytest-cov==2.12.1
 pytest-runner==5.3.1
 requests-mock==1.9.3
 Sphinx==4.1.2
-tox==3.24.1
+tox==3.24.3
 twine==3.4.2
 watchdog==2.1.3
 wheel==0.36.2