Zikula Core 1.3.6 is released as of November 6, 2013. This is strictly a security release for the Core 1.3.x series. All users of Core 1.3.0 - 1.3.5 are recommended to update as soon as possible. This release does not contain any other bug fixes or features over Core 1.3.5.
Installation/Upgrade: (from Core 1.3.5) simply overwrite the files in your current installation with the new files run the upgrade.php routine.
The release that was to be version 1.3.6 has been renamed to 1.3.7 and is yet unreleased. Please adjust your development module dependencies accordingly.