OS X 10.9.4

Mac OS X 10.9.4 was an update to Mac OS X 10.9 released on June 30, 2014. It had the following features:
 * 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

For detailed information about the security content of this update, see Apple security updates.