# Add the remote, call it "upstream": git remote add upstream https://github.com/whoever/whatever.git # Fetch all the branches of that remote into remote-tracking branches, # such as upstream/master: git fetch upstream # Make sure that you're on your master branch: git checkout master # Rewrite your master branch so that any commits of yours that # aren't already in upstream/master are replayed on top of that # other branch: git rebase upstream/master #If you don't want to rewrite the history of your master branch, (for # example because other people may have cloned it) then you should # replace the last command with However, for making further pull # requests that are as clean as possible, it's probably better to # rebase. git merge upstream/master.