diff --git a/requirements-testing.txt b/requirements-testing.txt
index cac09a88..5c7f8976 100644
--- a/requirements-testing.txt
+++ b/requirements-testing.txt
@@ -7,7 +7,7 @@ autopep8==1.5.4
 mypy==0.782
 py-spy==0.3.3
 codecov==2.1.9
-tox==3.19.0
+tox==3.20.0
 mccabe==0.6.1
 pylint==2.6.0
 rope==0.17.0