I had added a CEPH repo using the following command
rpm -Uhv http://download.ceph.com/rpm-octopus/el7/noarch/ceph-release-1-1.el7.noarch.rpm
Running yum update -y caused dependencies issues, so I had to remove the repo
First list which repos are installed
ls /etc/yum.repos.d/
rpm -qf /etc/yum.repos.d/ceph.repo
Remove the ceph repo
yum remove ceph-release-1-1.el7.noarch
yum clean all
yum update -y
All good now