Release notes for upgrade from Helsinki to Jakarta Before you upgrade from Helsinki to Jakarta, read the release notes for information about new features, notable changes, and fixes to existing functionality. New features and changes in Istanbul and Jakarta Each release family contains new functionality. Read to the release notes for details on the new features and changes in Istanbul and Jakarta. Istanbul release notes Jakarta release notes Patch and hot fix release notes Patches and hot fixes contain security fixes as well as fixes for products and applications. These fixes are listed in each family's Available Versions. Available versions (Istanbul) Available versions (Jakarta) Patch release notes are organized into three sections. Release notes section Type of information Security-related fixes Contains a KB article with details on the patch's fixed security bugs Notable fixes Lists important fixed PRBs in the patchImportant: Examine the notable fixes in each patch and consider adding them to your upgrade testing plans. For information on how to test different instances during upgrades, refer to Upgrade to Jakarta. All other fixes Lists all other fixed PRBs in the patch Refer to the Known Error Portal to quickly locate Known Error articles related to the various releases. Upgrade instructions After you have reviewed the release notes and patch information to understand all the changes that will be implemented in Jakarta, you can start upgrading your instance. For an overview of the upgrade process, release definitions, and upgrade testing, refer to Upgrade to Jakarta. For a step-by-step guide through the upgrade process, refer to Upgrade your instance and the Upgrade planning checklist (Jakarta).