Plesk upgrade failed with the following message:
XX packages excluded due to repository priority protections
Some packages are held by more than one repository. The
priorities plugin chooses packages from the highest-priority repository, excluding duplicate entries from other repos.
Disable priorities plugin by editing
/etc/yum/pluginconf.d/priorities.conf file the following way:
# cat /etc/yum/pluginconf.d/priorities.conf
enabled = 0
Launch the upgrade again.