Today, we are releasing a new RC version of Turris OS 5.1.5. We reverted upstream commit, which erased a U-boot environment for Turris Omnia, so it should be smooth for users, who are using mSATA SSD or any external storage.
There is updated reForis, which fixes SMTP form then you can find updates for unbound, mariadb, and foris-controller-sentinel-module. It fixes the issue described here Data Collection on Turris OS 5.1.4