Deepslate completely replaces stone from Y=0 to bedrock.Stone transitions to deepslate from Y=8 to Y=0.The layer above Y=8 is made up of regular stone.The caves now generate in 2 layers of different stone bases depending on the depth.
Click on "Options" which is next to the username textbox, then press "Force update!" on the "Launcher Options" window.
#MINECRAFT VOXEL MAP FOR MAC UPDATE#
To update Minecraft, launch the Minecraft Launcher.