While the update method will suit your needs in most cases, you may need to use more sophisticated solutions. If you do have such needs, you should look into DoctrineMigrationsBundle, which is not a part of Symfony, but it can be downloaded and installed through packagist.
The migrations bundle offers some more advanced features such as:
Allows you to modify the SQL code used for migration
Ability to rollback your changes
Ability to manually run a single version of migration