diff --git a/setup.cfg b/setup.cfg
index 2979f9d43..0179ba51a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,6 +6,7 @@ description-file =
 author = OpenStack Infrastructure Team
 author-email = openstack-infra@lists.openstack.org
 home-page = http://docs.openstack.org/infra/system-config/
+python-requires = >= 3.5
 classifier =
     Intended Audience :: Information Technology
     Intended Audience :: System Administrators