On server web interface is a message “There is a new version of UrBackup server available (2.1.18). Download it here.”
But for CentOS there is no 2.1.18 version in the repo:
cd /etc/yum.repos.d/
wget http://download.opensuse.org/repositories/home:uroni/CentOS_7/home:uroni.repo
yum install urbackup-server
Package urbackup-server-2.0.38.1660-6.1.x86_64 already installed and latest version
Nothing to do