Apple today released an update for OS X Mavericks, bringing its desktop OS to version 10.9.4. This update is recommended for all OS X Mavericks owners and includes the following changes:
Fixes an issue that prevented some Macs from automatically connecting to known Wi-Fi networks
Fixes issue causing the background or Apple logo to appear incorrectly on startup
Improves the reliability of waking from sleep
Includes Safari 7.0.5
The update is available to Mac owners via the Software Update feature in the Mac App Store.