Hi, Sphinx version 1.2 was just released and is not compatible with distutils in python 2.7. This causes all our doc builds to fail. Here is a change to stable/havana requirements to pin the version: https://review.openstack.org/#/c/61236/ If it lands, there will be automatic proposals to update requirements for all projects. Those will also need to land before any changes will be able to land on stable/havana branches. -Jim