Missha, I disagree with you for the reason why you should not update your address. I read a related immigration news, that is, CIC is hiring a bunch of people to investigate about 4000 PR cardholders who they previously approved because they suspected these people used fake addresses while they were applying for their pr. From my point of view, I don't think Canada will spend that much money on hiring people to check at your door but if I were you, I would let them know. As a matter of fact, I did informed CIC after I moved into a new place recently. Also, there must be a reason why we have the option to change our address on e-cas. Cheers!