Picoreplayer / Shairport-sync

Hi all, would like to install a current Shairport-sync version on my picoreplayers so I can use Airplay 2. The current version of Shairport-sync is 3.3.7rc2, but it can only do Airplay 1. How should I proceed? Don't have a plan. Who can help?

Thanks & greetings, Lemen