AttributeError builds

Getting the below error while trying to remove build artifacts on GitLab v 9.3.2 (local install). This is API v4 - wondering whether the API version is causing the below error.

Traceback (most recent call last):
  File "./gitlab-artifact-cleanup", line 214, in <module>
    main()
  File "./gitlab-artifact-cleanup", line 206, in main
    cleanup.cleanup_project(proj)
  File "./gitlab-artifact-cleanup", line 45, in cleanup_project
    for build in proj.builds.list(all=True):
  File "/usr/lib/python2.7/site-packages/gitlab/base.py", line 434, in __getattr__
    raise AttributeError(name)
AttributeError: builds