Change Upstreams

Your Pantheon site is now set up to use the the latest version of Drupal Integrated Composer upstream. To continue tracking additional changes to the Pantheon upstream, change the upstream your site is tracking with Composer:

terminus site:upstream:set $SITE drupal-composer-managed

Following the drupal-composer-managed upstream will help keep your site up to date with any general configuration changes recommended by Pantheon. The dependency you added above on drupal/core-recommended will keep you on the current version until you are ready to upgrade to the latest version of Drupal.