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Maintenance and security release of the Drupal 8 series.
This release fixes security vulnerabilities. Sites are urged to update immediately after reading the notes below and the security announcements:
This release also includes a security-related update for the phpunit dev dependency. Since 8.2.3, packaged Drupal releases no longer contain development PHP libraries. See Drupal 8 will no longer include dev dependencies in release packages for more information. This update ensures that Drupal core requires the most secure version of phpunit available, so you should update any sites that do include dev dependencies with this version. Using dev dependencies in production is still not recommended. Be sure to follow the update instructions completely, including removing old files.
No other fixes are included.
No changes have been made to the .htaccess, web.config, robots.txt or default settings.php files in this release, so upgrading custom versions of those files is not necessary.
A regression was found in this release.
See the list of the known issues for the 8.2.x branch.