Release notes for upgrade from Geneva to Istanbul Before you upgrade from Geneva to Istanbul, read the release notes for information about new features, notable changes, and fixes to existing functionality. New features and changes in Helsinki and Istanbul Each release family contains new functionality. Read to the release notes for details on the new features and changes in Helsinki and Istanbul. Helsinki release notes Istanbul release notes Patch and hot fix release notesPatches 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 (Helsinki) Available versions (Istanbul) 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 Istanbul. 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 Helsinki, you can start upgrading your instance. For an overview of the upgrade process, release definitions, and upgrade testing, refer to Upgrade to Istanbul. For a step-by-step guide through the upgrade process, refer to Upgrade your instance and the Upgrade planning checklist (Istanbul).