PHP.net: PHP 5.3.9 Released!
The PHP development group has officially announced the release of PHP 5.3.9, the latest in the 5.3.x series.
The PHP development team would like to announce the immediate availability of PHP 5.3.9. This release focuses on improving the stability of the PHP 5.3.x branch with over 90 bug fixes, some of which are security related.
Bugfixes and updates in this release include the max_input_vars directive, an autoloading issue with is_a and changes to the FPM SAPI module. You can see the full list of changes here or just go over and download this latest release and get to installing - source, Windows binaries.