These updates fix problems or add new features to your computer's operating system. Read through all the documentation that comes with these updates before installing them.
Updates for the OS X operating system are available for most versions. Before installing any of these updates, it is recommended that you scan your drive with Disk Utility, found in your Utilities folder.
For other OS X components and updates, use Software Update or visit the Apple Software Updates website.
OS X 10.9.x to 10.9.3 Update
OS X 10.8.x to 10.8.5 Update
Mac OS X 10.7.x to 10.7.5 Updates