http://hg.mozilla.org/build/talos/file/ee67e01c9d58/create_talos_zip.py We currently use HEAD for mozbase and oauth2 github dependencies in create_talos_zip.py . This is prone to breakge and it would be much better to tie to a particular version. However, if this is possible in github, I don't know how to do it. Alternate, the create_talos_zip.py file could be rewritten to take dependencies from pypi or other tarballs. However, this would be a much more extensive rewrite.