There isn't any rule except that you are obliged to inform the visa office but no timeline is given.Diako said:Has there been any similar case before? Is there any specific rule or previous announcement by Canadian Embassies in this respect?
I renewed my passport on Jan 2010 and sent them an email asking what to do, they (Damascus back then) replied that I should fax, email or post a copy of my new passport which I didn't because I heard update requests will be sent soon. I sent my new passport copy along with my updated documents in November 2010 and there wasn't any problem.
Now my wife renewed her passport last week. I'm just going to wait for the medicals and send it then.