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Apple today released an update for OS X Mavericks, bringing its desktop OS to version 10.9.4



From TUAW:
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
  Apple releases OS X 10.9.4, iOS 7.1.2, and Apple TV update