Can I stay on Angular 7 with Ionic 4.9 or is it recommended to update to Angular 8?

I was on Ionic 4.6 and I updated to Ionic 4.9, but did not update Angular 8.
Is it recommend to update Angular to 8?

Ionic 4.X will run against Angular 7 or 8. You can upgrade to Ionic 4.9 and wait to upgrade to Angular 8 until you are ready.