diff --git a/lower-constraints.txt b/lower-constraints.txt
index 300322f27c..6b7cfdbcf2 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -118,7 +118,7 @@ retrying==1.2.3
 rfc3986==1.1.0
 Routes==2.3.1
 simplejson==3.13.2
-six==1.10.0
+six==1.14.0
 snowballstemmer==1.2.1
 Sphinx==1.6.5
 sphinxcontrib-websupport==1.0.1