Hi @Matt_Sears,
As it stands we offer Asana Premium/Business and Enterprise plans on a tiers basis, starting with 5 , 10 and 15 Members. So if you’re team grew up to 6 members, you would have to opt for a 10 member plan. While we’re not planning to bring single premium plan in the near future, I would encourage you to add your vote to this thread. You can also reach out to our Sales Team who will be more than happy to answer any follow-up questions you might have!