[bitfolk] Stretch after Buster becomes "stable"

I’m already running a couple of fresh installs of Buster outside of Bitfolk, but I’d like to keep my VPS running Stretch for the time being. Do I need to make any changes to sources.list to carry on receiving security updates? I’ve currently got this:

deb http://deb.debian.org/debian stretch main
deb-src http://deb.debian.org/debian stretch main

deb http://deb.debian.org/debian-security/ stretch/updates main
deb-src http://deb.debian.org/debian-security/ stretch/updates main

deb http://deb.debian.org/debian stretch-updates main
deb-src http://deb.debian.org/debian stretch-updates main

Cheers,
Mike