yum update php
Setting up Update Process
Setting up repositories
plesk                     100% |=========================|  951 B    00:00
update                    100% |=========================|  951 B    00:00
base                      100% |=========================| 1.1 kB    00:00
atomic                    100% |=========================|  951 B    00:00
addons                    100% |=========================|  951 B    00:00
extras                    100% |=========================| 1.1 kB    00:00
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package php.i386 0:5.2.9-2.el4.art set to be updated
--> Running transaction check
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-mbstring
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-gd
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-snmp
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-imap
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-xmlrpc
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-pear
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-devel
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-ncurses
--> Processing Dependency: /usr/bin/php for package: psa-horde
--> Processing Dependency: php-cli = 5.2.9-2.el4.art for package: php
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-ldap
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-odbc
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-domxml
--> Processing Dependency: php = 4.3.9-3.22.15 for package: php-mysql
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Package php-ldap.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-mysql.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-xml.i386 0:5.2.9-1.el4.art set to be updated
---> Package php-xmlrpc.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-snmp.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-ncurses.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-gd.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-devel.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-cli.i386 0:5.2.9-2.el4.art set to be updated
---> Package psa-horde.noarch 0:3.1.7-cos4.build86080722.02 set to be updated
---> Package php-imap.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-odbc.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-mbstring.i386 0:5.2.9-2.el4.art set to be updated
---> Package php-pear.noarch 1:1.7.2-2.el4.art set to be updated
--> Running transaction check
--> Processing Dependency: php-pdo for package: php-mysql
--> Processing Dependency: libt1.so.5 for package: php-gd
--> Processing Dependency: php-pdo for package: php-odbc
--> Processing Dependency: php-common = 5.2.9-1.el4.art for package: php-xml
--> Processing Dependency: automake for package: php-devel
--> Processing Dependency: psa-pear >= 1.4.9 for package: psa-horde
--> Processing Dependency: autoconf for package: php-devel
--> Restarting Dependency Resolution with new changes.
--> Populating transaction set with selected packages. Please wait.
---> Package automake.noarch 0:1.9.2-3 set to be updated
---> Package autoconf.noarch 0:2.59-5 set to be updated
---> Package t1lib.i386 0:5.1.2-2.el4.art set to be updated
---> Package php-pdo.i386 0:5.2.9-2.el4.art set to be updated
---> Package psa-pear.noarch 0:1.4.9-20060517.1 set to be updated
--> Running transaction check
--> Processing Dependency: php-common = 5.2.9-1.el4.art for package: php-xml
--> Finished Dependency Resolution
Error: Missing Dependency: php-common = 5.2.9-1.el4.art is needed by package php-xml

yum clean all