I get the following error :
[root@vps /]# yum replace php53u --replace-with=php54 -y
Loaded plugins: fastestmirror, priorities, protectbase, replace
Loading mirror speeds from cached hostfile
* base: mirror.rackspace.com
* extras: mirrors.xmission.com
* mratwork-epel: fedora-epel.mirror.lstn.net
* mratwork-ius: dfw.mirror.rackspace.com
* updates: mirrors.cat.pdx.edu
http://centos.alt.ru/repository/centos/6/i386/repodata/repomd.xml: [Errno 14] Peer cert cannot be verified or peer cert invalid
Trying other mirror.
0 packages excluded due to repository protections
Replacing packages takes time, please be patient...
Error: No Package Matching php54