Cannot upgrade php to 5.3

[ProWebS]

Hello,

while trying to upgrade php to 5.3 I get the following errors:

Gathering information about installed license key...
Retrieving information about the installed packages...
File downloading PSA_9.5.4/dist-rpm-CentOS-5-x86_64/build-9.5.4-cos5-x86_64.hdr.gz: 10%..20%..30%..40%..50%..60%..70%..80%..90%..100% was finished.
File downloading PSA_9.5.4/update-rpm-CentOS-5-x86_64/update-9.5.4-cos5-x86_64.hdr.gz: 10%..20%..30%..40%..50%..60%..70%..80%..90%..100% was finished.
File downloading PSA_9.5.4/thirdparty-rpm-CentOS-5-x86_64/thirdparty-9.5.4-cos5-x86_64.hdr.gz: 11%..22%..34%..40%..52%..63%..75%..81%..93%..100% was finished.
Determining the packages that need to be installed.

ERROR: Unable to install the "psa-php53-configurator-1.5.3-cos5.build95110708.13.noarch" package.

The following could cause the installation failure:
1) psa-php53-configurator-1.5.3-cos5.build95110708.13.noarch: No suitable solutions were found
for the "php53-sqlite2" dependency.

2) php53-sqlite2-5.3.2-11070811.i386: No suitable solutions were found
for the "libc.so.6(GLIBC_2.3)" dependency.

3) Unable to downgrade 'glibc' package to version 2.5-65:
version 2.5-81.el5_8.1 is currently installed.

There were also other problems encountered. For details,
refer to the log file: /tmp/autoinstaller3.log.

Not all packages were installed.
Please, contact product technical support.