This is a bit old, but for anyone that comes across this I wanted to add a bit about how we go about updating CoreOS on DigitalOcean. All three release channels (Alpha, Beta, Stable) are available. The team at CoreOS builds images for these that are specifically tailored for our platform. These get automatically ingested into our system and run through a number of tests before being made available to users. So if you are in need of a specific release, our current process should ensure that it will be available on DO shortly after it is released by CoreOS.