To be able to make a pull request to an open source project, one might need to update the forked repository. This can be done using git rebase using the following steps:

1. Add the remote original repo as upstream to your local repo

   git remote add upstream <original repo>

2. Fetch all the branches from the remote upstream

   git fetch upstream

3. Rebase local master with upstream’s master

   git rebase upstream/master

4. Update your forked repository master by pushing the rebased branch

   git push origin master