September 2020 Changelog
Drupal 9 is available for early access testing with new or existing sites. We don't recommend fully switching a live site to Drupal 9 until we have upgraded our version of MariaDB.
Drupal 8.9.3 is now available on the Pantheon platform. Detailed information on applying and debugging core updates can be found in the Core Updates documentation. For more information, see the Drupal 8.9.3 release notes.
WordPress 5.5 has been released on the Pantheon platform. This version of WordPress introduces a new method,
wp_get_environment_type(), which returns whether your site is running on a live, test or development environment. Pantheon supports this method, so it will return the correct value on any site that has upgraded to WordPress 5.5.