This documentation is for a version that has reached its End Of Life. Such versions are no longer supported and don't receive security updates. Consider updating to a newer version.
At this point, you should have a composer.json file with the correct requirements and you can update dependencies.
If you want to first test how the update proceeds without actually updating any packages, you can try the command with the --dry-run switch:
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Then, run composer update to update the dependencies.
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