Apple has released Mac OS X 10.9.2, which offers a solution to the SSL security flaw that's been in the news this week. It also:

▪ Adds the ability to make and receive FaceTime audio calls 
▪ Adds call waiting support for FaceTime audio and video calls
▪ Adds the ability to block incoming iMessages from individual senders
▪ Includes general improvements to the stability and compatibility of Mail
▪ Improves the accuracy of unread counts in Mail
▪ Resolves an issue that prevented Mail from receiving new messages from certain providers 
▪ Improves AutoFill compatibility in Safari
▪ Fixes an issue that may cause audio distortion on certain Macs
▪ Improves reliability when connecting to a file server using SMB2
▪ Fixes an issue that may cause VPN connections to disconnect
▪ Improves VoiceOver navigation in Mail and Finder
▪ Improves VoiceOver reliability when navigating websites
▪ Improves compatibility with Gmail Archive mailboxes
▪ Includes improvements to Gmail labels
▪ Improves Safari browsing and Software Update installation when using an authenticated web proxy
▪ Fixes an issue that could cause the Mac App Store to offer updates for apps that are already up to date
▪ Improves the reliability of diskless NetBoot service in OS X Server
▪ Fixes braille driver support for specific HandyTech displays
▪ Resolves an issue when using Safe Boot with some systems 
▪ Improves ExpressCard compatibility for some MacBook Pro 2010 models
▪ Resolves an issue which prevented printing to printers shared by Windows XP
▪ Resolves an issue with Keychain that could cause repeated prompts to unlock the Local Items keychain
▪ Fixes an issue that could prevent certain preference panes from opening in System Preferences
▪ Fixes an issue that may prevent migration from completing while in Setup Assistant.

You can download the update at the Mac App Store.