Do I need a passport or travel document?
You and your family members must have valid passports or travel documents. If any of the documents are to expire soon, you should renew them and provide copies of the new passport or travel document to the office processing your application. Diplomatic, official, service or public affairs passports cannot be used to immigrate to Canada. You must have a valid regular or private passport when you arrive. The validity of your visa may be affected by the validity of your passport.
Direct quote from the immigration guide. I personally would update them first so they have everything they need from the start but that is up to you.