diff --git a/requirements_dev.txt b/requirements_dev.txt
index 35e787d..8cc121c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -10,6 +10,6 @@ plumbum==1.6.8
 pytest==5.3.5
 PyYAML==5.3
 Sphinx==2.4.1
-tox==3.14.3
+tox==3.15.1
 wheel==0.34.2
 watchdog==0.10.2