In the stable/queens branch, since openstacksdk0.11.3 and os-service-types1.1.0 are described in openstack's upper-constraints.txt, https://github.com/openstack/requirements/blob/stable/queens/upper-constraints.txt#L411 https://github.com/openstack/requirements/blob/stable/queens/upper-constraints.txt#L297 If I do > git clone https://git.openstack.org/openstack-dev/devstack -b stable/queens And then stack.sh We will see it is using openstacksdk-0.12.0 and os_service_types-1.2.0 Having said that, we need the older version, how to configure devstack to use openstacksdk===0.11.3 and os-service-types===1.1.0 Thanks. Louie