Gemnasium shows one red dependency, and that is pygments.
It's only used in the paver command output, and there it's not even really needed as there is an alternative import (colorize) if it's not found.
Cleanup for the codebase:
Remove pygments in favor of something else that is used elsewhere, if that makes sense.
If it makes sense to keep it:
Move it down in base.txt or otherwise indicate that it's not a production dependency?
Update to the latest version
Note when pointing this story: pygments is also in the docs/shared/requirements.txt file, and I'm not sure what that file is for or what the implications are. There it's pinned to pygments==1.5, whereas in base.text it's pinned to pygments==2.0.1.