Use bash (or even ksh) instead of zsh?

Can I set the shell to bash or am I locked into zsh?
thx

  /config hassio info                 
arch: aarch64
channel: stable
hassos: "2.12"
homeassistant: 0.100.3
hostname: hassio
logging: info
machine: odroid-c2
supervisor: "192"
supported_arch:
- aarch64
timezone: America/Anchorage