So I did an upgrade and my tests ran fine. Once I deployed to production everything
blew up. WTF?
Okay, but this really has nothing to do with Pyup. Anyway. Some things are very hard
to test automatically, maybe you've been bitten by that. Or you just mocked every
call to that library during your tests. Or you rely on external libraries your CI server
has but your production environment hasn't. There are a lot of things that can go wrong
during an update, so you should be prepared for that.