How to reinstall requirements.txt
After you've pulled the latest changes into your requirements.txt, you can absolutely rerun pip.  Run the command with pip install -r requirements.txt and it will install any new modules.
I'm working in this shared Django project, a colleague is the owner of the repo in Github. The problem I am facing right now is that he added raven to his packages and in github the requirements.txt file is updated, however when I tried with git pull, locally, my requirements.txt does not have raven added. He told me that I have to reinstall requirements.txt so I tried with pip freeze > requirements.txt but nothing change.
How can I update my requirements.txt file according the updates made from Github?