always seeing "An update is available" for "Plesk Updater"

[shall]

Within the Plesk Updates pane of the control pane, I always see "An update is available" for "Plesk Updater". I've installed this update a couple times a week for months. The dates never change. No errors are reported. Any ideas on how to fix it? My release is Apr 7, 2008, but the current release is Apr 12, 2010.