jail -r jailname
freebsd-update -f /usr/local/etc/jail-update.conf --currently-running `jexec jailname freebsd-version -u` -b /jails/majail fetch -r 13.0-RELEASE upgrade
freebsd-update -f /usr/local/etc/jail-update.conf -b /jails/majail fetch install 
jail -c jailname
freebsd-update -f /usr/local/etc/jail-update.conf -b /jails/majail fetch install 
pkg -j jailname bootstrap -f
pkg -j jailname upgrade
jail -rc jailname