diff --git a/requirements_dev.txt b/requirements_dev.txt
index c25cd9e..b0723fe 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,6 +4,6 @@
 pip==20.2.3
 pytest==6.1.0
 Sphinx==3.2.1
-tox==3.20.0
+tox==3.20.1
 twine==1.15.0
 wheel==0.35.1