diff --git a/tox.ini b/tox.ini
index ecb2759..48ca1f7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,6 @@ commands=
 
 [testenv:flake8]
 deps=
-    six
     flake8
 commands=
     flake8 --exclude=".*" flask_migrate tests