Apple seem to have such a fanboi base that they are keen tell any listening PC users that they don't have to be updating 24/7 - not true, they just don't know it. Updates for OSX have run into the gigabytes already but unlike MS who own up to everything and even update automatically and in the open Apple keep shtum and bury the update interface where nobody ever looks.
The latest patchload covers 20+ vulnerabilities in OSX and safari and is hot on the heels of updates which previously broke wireless access on some apple laptops. Windows users that have previously had Safari force fed to them also need to update to the latest version of the browser. Apple users bemused by the fact that they really do need to update should look for Software Update in the System Preferences.