diff --git a/setup.cfg b/setup.cfg
index df6264b..29bd242 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,6 +7,7 @@ author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/octavia-lib/latest/
 license = Apache License, Version 2.0
+python-requires = >=3.6
 classifier =
     Development Status :: 5 - Production/Stable
     Environment :: OpenStack