Using Drush to update to a specific version of core (not just the latest)

By default, the drush pm-update command will update Drupal core and all enabled projects to the latest recommended releases. The optional project argument allows you to provide a list of installed projects to update, thereby limiting the scope of the update.

You can also pass a specific version of Drupal core as a project argument and Drush will limit the upgrade to that version of core (and core only, unless you pass other projects along as arguments.)

It's a good idea to take a backup first:

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