If you you don't want to update it even if a newer version is available YUM actually has a plugin called yum-versionlock.
1. Install the yum-plugin-versionlock package.
2. Make sure - /etc/yum/pluginconf.d/versionlock.conf exists, and contains the following text: enabled = 1
3. Add the list of packages which you do not want to be updated to /etc/yum/pluginconf.d/versionlock.list.
Each package should go on its own line. For example:
[root@svn01dev ~]# yum install screen
Loaded plugins: security, versionlock
Reading version lock configuration
Setting up Install Process
Nothing to do
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