[CentOS] CentOS 5.6 and php53 packages

Hello fellow CentOS users,

until now I was using CentOS 5.5 with php 5.3 through this file:

# grep -v ^# /etc/yum.repos.d/CentOS-Testing.repo
[c5-testing]
name=CentOS-5 Testing
baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing
includepkgs=php*

Today I have updated to CentOS 5.6 by running "yum update"
and only after that (mea culpa!) I've noticed at
http://wiki.centos.org/Manuals/ReleaseNotes/CentOS5.6 -

  6.2. New packages in 5.6 that were not present in 5.5
  bind97
  hplip3
  php53

Do you think it is safe to remove /etc/yum.repos.d/CentOS-Testing.repo
and run "yum update" again or will my Drupal 7 site burn and die?

Thanks
Alex