diff --git a/requirements.txt b/requirements.txt
index 68a36940e..fca457e76 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,6 +8,6 @@ flake8==3.5.0
 
 # Testing
 # ------------------------------------------------------------------------------
-tox==3.0.0
+tox==3.1.1
 pytest==3.6.3
 pytest-cookies==0.3.0