diff --git a/pip-requirements-test.txt b/pip-requirements-test.txt
index 359ceb7..75f524c 100644
--- a/pip-requirements-test.txt
+++ b/pip-requirements-test.txt
@@ -1,2 +1,2 @@
-tox==3.16.1
+tox==3.21.3
 pylint==2.5.3