The command `composer update --dry-run` is used to perform the process of updating dependencies in a project, but without actually changing any files or installing updates. The `--dry-run` option (or `-n`) instructs Composer to simulate the update, showing which packages will be updated without making actual changes to the `composer.json` files or installing updates.
This is a useful feature for previewing what changes will occur in your project when updating dependencies. By running `composer update --dry-run`, you can see which versions of packages will be installed or updated and make decisions about changes to make in `composer.json` before actually updating dependencies.
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