As is clear from the version number (switching from 5.1.9 to 5.9 immediately), the update contains the final preparations for upgrading to version 6. In addition, the update itself is very large - the changes affected 12 modules. Beta The final release will most likely be in the form of “1C-Bitrix 6.0” closer to the end of the month. As usual, fixed old bugs, added new components in most modules, small changes in the interface.