incodewetrust.ias.u-psud.fr

1. Clone your fork:

  git clone git@github.com:YOUR-USERNAME/YOUR-FORKED-REPO.git

1. Add remote from original repository in your forked repository:

  cd into/cloned/fork-repo
  git remote add upstream git://github.com/ORIGINAL-DEV-USERNAME/REPO-YOU-FORKED-FROM.git
  git fetch upstream

1. Updating your fork from original repo to keep up with their changes:

  git pull upstream master

1. Push to gitlab remote

 git push

Source : https://gist.github.com/CristinaSolana/1885435