diff --git a/lower-constraints.txt b/lower-constraints.txt
index e91ddc00de..e39f713223 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -75,7 +75,6 @@ requests==2.18.4
 requestsexceptions==1.4.0
 rfc3986==1.2.0
 simplejson==3.13.2
-six==1.10.0
 smmap2==2.0.3
 smmap==0.9.0
 sphinxcontrib-svg2pdfconverter==0.1.0