diff --git a/docs/requirements.txt b/docs/requirements.txt
index ab546ff2..9f026a3c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,7 +4,6 @@ numpydoc
 recommonmark
 m2r
 mock
-six
 multiprocess
 click
 asciitree