Originally Posted by
joejones
I believe you also get a zairyu card if you are on a work visa and change employers, or if you get a new passport, or anything else that would render the data on your ARC out of date (other than your address), since these are all items that now have to be reported to immigration.
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It seems that you no longer need to tell immigration when you get a new passport. Without a zairyu card, you need to just keep your old passport with your valid SOR in as well as your ARC for re-entry into Japan - (ARC acts as zairyu card, so you don't need a current re-entry permit even without switching to the new card).