[2020] Mac Version Update Issues

So I recently started hosting a dedicated server to play with some friends. One friend is using a Mac, and appears to be on v312, while the server and everyone else is on v313. This means Mac friend can't join the server. Any idea when there will be a v313 available for Mac? Or if there is a way he can manually update?

Note, we're all running the game from Epic Games, so it was already a challenge to get a server running properly.