The OS X Mavericks v10.9.1 Update is recommended for all Mac Pro (Late 2013) OS X Mavericks users. It improves the stability, compatibility, and security of your Mac.

This update includes:

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
Resolves issue that prevents a Contact group name from populating the address field
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