OS X 10.9.1

Mac OS X 10.9.1 was an update to Mac OS X 10.9 released on December 16, 2013. It had the following features:
 * Improved support for Gmail in OS X Mail, and fixes for users with custom Gmail settings
 * Improves the reliability of Smart Mailboxes and search in Mail
 * Fixes an issue that prevented contact groups from working properly in Mail
 * Resolves an issue that prevented VoiceOver from speaking sentences that contain emoji
 * Fixes an issue that prevented iLife and iWork apps from updating on non-English systems
 * Addresses an issue that may cause multiple prompts to unlock “Local items” keychain
 * Addresses an issue that may cause Japanese keyboards to retain a previously used language
 * Includes Safari 7.0.1
 * Fixes an issue that could cause Safari to become unresponsive when filling out forms on fedex.com, stubhub.com, and other websites
 * Improves Credit Card Autofill compatibility with websites
 * Improves VoiceOver compatibility with facebook.com
 * Updates Shared Links periodically when open in the Safari Sidebar

External References
Apple: About the OS X 10.9.1 Update