How to Update to ionic2


Hi guys,how do i update to ionic 2…i am still using the old ionic…should i run the usual command: sudo npm install -g ionic?
I am using mac and developed a project which i had to install material using bower,but since ionic 2 already comes with material i would like to update to 2.I am new to ionic and have been a native android and ios native developer for 4 years and would like to advance on my ionic skills,but cant quite figure out how to update to the new ionic 2.Then other thing,i had updated to ionic beta.some months back,but i still dont see any material design features after this update.