About the OS X Mavericks v10.9.4 Update
Learn about the OS X Mavericks v10.9.4 Update.
Updating your system
You should back up your system before installation. To do this you can use Time Machine.
Do not interrupt the installation process once you have started to update your system.
You might experience unexpected results if you have third-party system software modifications installed, or if you've modified the operating system through other means.
Choose Software Update from the Apple menu () to check for the latest Apple software using the Mac App Store, including this update.
Other software updates available for your computer might appear, which you should install. Note that an update's size can vary from computer to computer when installed using Software Update. Also, some updates must be installed prior to others.