Mac OS X 10.5.5 Released

Apple have upgraded Leopard to 10.5.5. The latest upgrade is available through Software Update and will be downloaded automatically if you have Check for Updates selected in your Preferences.

“The 10.5.5 Update is recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac.”

Further details of the upgrade can be found on the Apple support page
http://support.apple.com/kb/HT2405 along with a description of the Security Updates http://support.apple.com/kb/HT1222