Adobe’s Plans for Photoshop and Lightroom for OS X
Jeff Tranberry of Adobe details the plans for which versions of OS X will be required for the next versions of Adobe Photoshop and Adobe Lightroom.
In order to leverage the latest operating system features and technologies, the next major release of Photoshop CC will require Mac OS X 10.9 (Mavericks) or above.
The next major release of Lightroom currently plans to support OS X 10.8 (Mountain Lion) and above.