diff --git a/requirements/test.txt b/requirements/test.txt
index 9ec291c..55187bf 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -3,4 +3,4 @@ coveralls==1.7.0
 mock==2.0.0
 pytest==4.4.0
 pytest-cov==2.6.1
-tox==3.8.4
+tox==3.8.6