If your system is not Leap 15.0, then change repository accordingly to your needs.

Steps:
1. Add repository: https://download.opensuse.org/reposi...p_15.0/x86_64/
2. Make "Full repository Vendor change": https://en.opensuse.org/SDB:Vendor_change_update
3. Update your system
4. Reboot

When I tried to update only Mesa packets without other components my system had hanged.