If theres offical update (check via Kies), you need to root phone and hunt for some custom system (best place for that is XDA)
How to update Samsung GT-S5360 2.3.6 to any 4.0 or updated version ? Build version is GB.DDLK2
How to update Samsung GT-S5360 2.3.6 to any 4.0 or updated version ? Build version is GB.DDLK2