diff --git a/requirements/base.txt b/requirements/base.txt
index 77b4da0..4951db1 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -4,3 +4,5 @@ openapi_codec>=1.3.2
 ruamel.yaml>=0.15.34
 inflection>=0.3.1
 future>=0.16.0
+six>=1.11.0
+uritemplate>=3.0.0