diff --git a/tox.ini b/tox.ini
index b62100026..b1babc7fd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,7 +56,6 @@ deps =
     pyOpenSSL==16.2.0
     queuelib==1.4.2
     service_identity==16.0.0
-    six==1.10.0
     Twisted==17.9.0
     w3lib==1.17.0
     zope.interface==4.1.3