diff --git a/requirements.txt b/requirements.txt
index 271ba549..15b9aad8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,5 +7,5 @@ binaryornot==0.4.4
 pytest==3.2.2
 pycodestyle==2.3.1
 pyflakes==1.6.0
-tox==2.9.0
+tox==2.9.1
 pytest-cookies==0.2.0