---
fixes:
  - >
    [`bug 1523369 <https://bugs.launchpad.net/keystone/+bug/1523369>`_]
    Deleting a project will now cause it to be removed as a default project
    for users. If caching is enabled the changes may not be visible until the
    user's cache entry expires.
upgrade:
  - >
    The identity backend driver interface has changed. A new method,
    `unset_default_project_id(project_id)`, was added to unset a user's
    default project ID for a given project ID. Custom backend implementations
    must implement this method.