This is a release candidate for the next minor version (feature release) of Drupal 9. Release candidates are not supported for production sites, but they are intended for widespread testing in preparation for the upcoming stable release. More information on release candidates.
This minor release provides new improvements and functionality without breaking backward compatibility (BC) for public APIs. Note that there may be changes in internal APIs and experimental modules that require updates to contributed and custom modules and themes per Drupal core's backwards compatibility and experimental module policies.
Drupal 9.1.x contains new features, and should be the target for new site development. Drupal 9.0.x will continue to have security support until June 2021. Drupal 8.9.x will continue to have security support until November 2021.
Regardless of which version you choose now, features will only be added to Drupal 9 minor releases, so plan to adopt Drupal 9 this year so that you can easily update to Drupal 9.2 and later.
Important update information
If you are updating from 9.0.x or earlier, also read:
Security update required!
This release fixes security vulnerabilities. Sites that installed 9.1.0-alpha1 or 9.1.0-beta1 are urged to upgrade immediately after reading the notes below and the security announcement:
Updating from Drupal 8
For information on updating from Drupal 8 to Drupal 9, see Upgrading a Drupal 8 site to Drupal 9.
Sites on 8.7 or earlier must update to either 8.8 or 8.9 before updating to Drupal 9 as all Drupal 8 update functions from before Drupal 8.8.0-rc1 were removed from Drupal 9. We recommend updating to 8.9.x, as well as updating all contributed modules, before updating to any Drupal 9 release.
Note: The migration paths from Drupal 6 and Drupal 7 to Drupal 9 will remain supported throughout Drupal 9's release cycle.
Note for users of the Experimental Workspaces module
Existing Drupal 8 sites using the experimental Workspaces module must update to at least Drupal 8.8.2 before updating to Drupal 9. (This is due to a required data integrity fix.) Remember that Workspaces is currently in beta status and is not intended for production.
Upgrading from Drupal 7
Drupal 7 users can continue to migrate to Drupal 8.9, or migrate to 9.0 or 9.1 directly. The upgrade path for multilingual sites is stable in Drupal 8.9, 9.0 and 9.1!
Release type: Security update