# official debian repository:
  deb     http://ftp.debian.org/debian/ bookworm main contrib non-free-firmware non-free
  deb-src http://ftp.debian.org/debian/ bookworm main contrib non-free-firmware non-free

# security updates:
  deb     http://security.debian.org/debian-security bookworm-security main contrib non-free-firmware non-free
  deb-src http://security.debian.org/debian-security bookworm-security main contrib non-free-firmware non-free