Do I need to update my new Canadian passport with current immigration stamps in Thailand?

The requirement to update your new Canadian passport with the current stamp at Thai immigration depends on your visa status. If you are in Thailand on a tourist visa with a free 60-day entry stamp, you can simply show both passports when departing. However, if you hold a long-term visa extension such as a Non-O, Non-B, or Non-ED, you need to take both passports to the immigration office where you received your extension to have the stamps transferred to your new passport.