diff --git a/requirements-dev.txt b/requirements-dev.txt
index 1e55773..060074c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 -r requirements.txt
-tox==3.21.1
+tox==3.21.2
 coverage==5.3.1
 pylint==2.6.0
 pytest-cov==2.10.1