diff --git a/requirements.txt b/requirements.txt
index 48ebef8..140050c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ freezing-model @ https://github.com/freezingsaddles/freezing-model/archive/0.7.2
 greenstalk==1.0.1
 gunicorn==22.0.0
 python-mimeparse==1.6.0
-six==1.14.0
+six==1.16.0