https://www.canada.ca/en/immigration-refugees-citizenship/news/notices/application-kit-spousal-sponsorship.htmlyes unfortunately you will have to use the new one, if you send old form, they may reject the app
They updated the checklist and guides and gave grace period until March 15. Funny thing, even though they mentioned that no form has been updated, the IMM 5406 (additional family information) did infact update as I mentioned. However, I do not see any thing 'new' on it other than they just re-arranged the columns and now ask for emails addresses of all family members.