Canadian English is going through a vowel shift right now. The shift is much smaller than the great vowel shift, but still notable.
https://www.macleans.ca/society/life/in-the-midst-of-the-can...
https://www.macleans.ca/society/life/in-the-midst-of-the-can...
Maybe related to what’s happening in Canadian English?
I’m an American, recently back from 2 years in Toronto, and the Toronto accent is just not the stereotypical Canadian accent that I imagined I’d hear. Far less Minnesota, a bit more New Jersey.