diff --git a/requirements/test.txt b/requirements/test.txt
index 2ae78335..4967c1e7 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -7,7 +7,7 @@ codecov==2.1.9
 coverage==4.5.3
 flake8==3.8.4
 mypy==0.790
-tox==3.16.1
+tox==3.20.1
 
 # Packages dependencies:
 #   - codecov: