RancherOS 1.5.8 not on https://releases.rancher.com/os/releases.yml

Hi,

I happened to notice that RancherOS version 1.5.8 is not listed on the releases list at
https://releases.rancher.com/os/releases.yml
This means that it is not possible to upgrade to this version using

sudo ros os upgrade

Just curious as to why/whether this is intended ?

Thanks,