Contao version 3.5.10 is available. The bugfix release fixes several issues, including issues with the search index, the book navigation and the back end user switching. In addition, the handling of IDNA e-mail addresses has been consolidated.
New versions of the Composer plugin for Contao have been released! They now support installing your extensions in both, Contao 3 as well as Contao 4! All developers are asked to update their extensions.