How do I update a GitHub forked repository?

I recently forked a project and applied several fixes. I then created a pull request which was then accepted.

A few days later another change was made by another contributor. So my fork doesn't contain that change.

How can I get that change into my fork? Do I need to delete and re-create my fork when I have further changes to contribute? Or is there an update button?

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In your local clone of your forked repository, you can add the original GitHub repository as a "remote". ("Remotes" are like nicknames for the URLs of repositories - origin is one, for example.) Then you can fetch all the branches from that upstream repository, and rebase your work to continue working on the upstream version. In terms of commands that might look like:

# 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 git merge upstream/master. However, for making further pull requests that are as clean as possible, it's probably better to rebase.

If you've rebased your branch onto upstream/master you may need to force the push in order to push it to your own forked repository on GitHub. You'd do that with:

git push -f origin master

You only need to use the -f the first time after you've rebased.

As your fork only exists on github, and github does not have tools for doing merges through the web interface, then the right answer is to do the upstream merge locally and push the changes back to your fork. –

Syncing a fork

1. Open Terminal.

2. Change the current working directory to your local project.

3. Fetch the branches and their respective commits from the upstream repository. Commits to master will be stored in a local branch, upstream/master.

git fetch upstream
remote: Counting objects: , done.
remote: Compressing objects: % (/), done.
remote: Total  (delta ), reused  (delta )
Unpacking objects: % (/), done.
From https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY
 * [new branch]      master     -> upstream/master

4.Check out your fork's local master branch.

git checkout master
Switched to branch 'master'

5.Merge the changes from upstream/master into your local master branch. This brings your fork's master branch into sync with the upstream repository, without losing your local changes.

git merge upstream/master
Updating a422352..5fdff0f
Fast-forward
 README                    |     -------
 README.md                 |     ++++++
  files changed,  insertions(+),  deletions(-)
 delete mode  README
 create mode  README.md

If your local branch didn't have any unique commits, Git will instead perform a "fast-forward":

git merge upstream/master
Updating 34e91da..16c56ad
Fast-forward
 README.md                 |     +++--
  file changed,  insertions(+),  deletions(-)