When installing epel repository in centos in some conditions there is an error during yum update.
This is an epel repository bug
Work around applied:
In /etc/yum.repos.d/epel.repo, commented out the following lines;
Enabled baseurl lines in configuration file and repointed to new repo.
Yum update found that epel-release was out of date and updated to epel-release 7-11. Working as expected.