diff --git a/requirements.txt b/requirements.txt
index 6a581002b5b..ec857fab419 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,6 +20,6 @@ pyflakes==1.1.0
 pyroma==2.0.2
 pytz==2016.2
 requests==2.9.1
-six==1.10.0
+six==1.15.0
 snowballstemmer==1.2.1
 sphinx-rtd-theme==0.1.9