AMD Driver update

How do I update the AMD Radeon Pro 5500 XT driver on my imac? There only seems to be updates for Windows – so, I partitioned my drive to install Windows Bootcamp, but it says it does not detect any AMD drivers on my computer. The reason I need to update it is because the 'liquify tool' in Photoshop isn't functioning correctly without the graphics update. Any help on this matter would be greatly appreciated.