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I forked a project, applied several fixes and created a pull request which was 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?

I forked a project, made changes, and created a pull request which was accepted. New commits were later added to the repository. How do I get those commits into my fork?