diff --git a/requirements/base.txt b/requirements/base.txt
index d8c5017..a05019a 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -4,7 +4,7 @@ openapi_codec>=1.3.2
 ruamel.yaml>=0.15.34
 inflection>=0.3.1
 future>=0.16.0
-six>=1.11.0
+six>=1.10.0
 uritemplate>=3.0.0
 
 djangorestframework>=3.7.7