Possible Duplicate:
How to prevent updating of a specific package?
How can I force a package to stay at the current version, even though there's an update?
Possible Duplicate:
How to prevent updating of a specific package?
How can I force a package to stay at the current version, even though there's an update?
That is a fairly simple setting you can set from Synaptic Package Manager.
Select the package you do not want to upgrade, then head over to the menubar and click Package->Lock Version
This will force the selected package not to upgrade.