You can do this to upgrade your subversion :
For CentOS/RHEL 7 Users:
[WandiscoSVN]
name=Wandisco SVN Repo
baseurl=http://opensource.wandisco.com/centos/7/svn-1.8/RPMS/$basearch/
enabled=1
gpgcheck=1
For CentOS/RHEL 6 Users:
[WandiscoSVN]
name=Wandisco SVN Repo
baseurl=http://opensource.wandisco.com/centos/6/svn-1.8/RPMS/$basearch/
enabled=1
gpgcheck=1
For CentOS/RHEL 5 Users:
[WandiscoSVN]
name=Wandisco SVN Repo
baseurl=http://opensource.wandisco.com/centos/5/svn-1.8/RPMS/$basearch/
enabled=1
gpgcheck=1
Next you create a repo for your subversion:
vi /etc/yum.repos.d/wandisco-svn.repo
Copy paste which one repo you used to wandisco-svn.repo
file.
Then optionally, but advised, add the repository gpg signature:
wget http://opensource.wandisco.com/RPM-GPG-KEY-WANdisco
gpg --quiet --with-fingerprint ./RPM-GPG-KEY-WANdisco
rpm --import ./RPM-GPG-KEY-WANdisco
And finally execute this below :
yum clean all
yum remove subversion
yum install epel-release
yum install subversion
Don't forget to use your root access to do that. :D