pip upgrade on dotcloud push
===

Is it possible to force the builder to use the pip `--upgrade` flag when performing a push? 

I seem to have an issue where there is a dependency that isn't being upgraded. I have changed the dependency in my requirements.txt file to use a git repository containing a bug fix rather than pypi but it doesn't seem to update it on the server as it's still getting errors.

Or is there a way to specify in the requirements file? I have checked the pip documentation but couldn't find an answer there.