How to require a fork with composer?

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The most common (and easiest) way of doing it is using a VCS repository.

All you have to do is add your fork as a repository and update the
version constraint to point to your custom branch. Your custom branch
name must be prefixed with dev-.

Assuming you forked monolog/monolog and created a branch called bugfix, you would update your composer.json like this:

{
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/igorw/monolog"
        }
    ],
    "require": {
        "monolog/monolog": "dev-bugfix"
    }
}

Note that you don’t change the require statement except to specify your bugfix branch. You still reference the upstream package (monolog/monolog), not your personal fork (igorw/monolog), and the branch name is prefixed with dev-. You can read details in the docs

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