They released PHP5.5.11 on Apr-03 06:21:19UTC.
The php.ini-production has nothing changed. As the official PHP binary includes php5apache2_4.dll, I extract the zip archive and replace all PHP5.5.10 files with all PHP5.5.11 files except my php.ini. Then, I restart my Apache. That’s it.
If you need how to configure PHP5.5, please see the post. It is for a mbstrings user, but the information gives some help for you.