How to update Minecraft ps3 edition?

If you open the game it should give you the option to update it. You need be connected to the internet. Its a pretty small game so you could try deleting it and installing it again and it should dow load the most recent version or give you the option to update it when you start the game up if it doesn't when you first try.

If there's an update available, it'll automatically prompt you when you load the game provided you are connected to the internet.