This is a patch release of Drupal 8 and is ready for use on production sites. See the CHANGELOG.txt for a summary of changes and improvements since the last minor release. Learn more about Drupal 8.

This release downgrades the ckeditor library included with Drupal core from version 4.7.3 to 4.7.2, otherwise it is identical to Drupal 8.4.1.

This release only contains bug fixes, along with documentation and testing improvements.

If you have not already upgraded to 8.4.0, read the Drupal 8.4.0 release notes before upgrading to 8.4.2.

The following important migrate issues were resolved in 8.4.1 (in addition to the dozens of other fixes listed at the end of this post):

Known issues

There are no known regressions in this release.

Search the issue queue for all known issues.

Changes since 8.4.0: