diff --git a/requirements.txt b/requirements.txt
index ffa7c5711..fb43d1f52 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ arrow==0.10.0
 funcy==1.7.3
 graphql-core==1.1
 pytz==2017.2
-six>=1.10.0
+six==1.10.0