188.8.131.52. is now available. This update fixes a number of bugs in 5.3.3. A complete list of changes is available here
Those release notes only cover what has changed since 5.3.3. For a complete list of a what has changed in 5.3.3, check out the concrete 5.3.3 release notes.
You can download concrete5 5.3.3 from here:
Important note: If you are upgrading to 5.3.3. from a previous version of concrete5, please read these important instructions.