Recommended OS X version for Appium?

It’d be nice to get this line in the Appium docs updated unless it already is :S
“Appium requires Mac OS X 10.7, but 10.8 or 10.9 is recommended.”

10.9 supports only up to Xcode 6.2 which supports only up to iOS 8.2
(source: https://en.wikipedia.org/wiki/Xcode)

I’d like to update my OS X to the latest so I can use iOS 9 simulators but I’m not sure if it is recommended to do so or not.