Updated PHP version, old virtual hosts still use old version


I have enabled REMI repository (while knowing that it’s not officially supported) and updated PHP 5.3 to PHP 5.5.
However, existing virutal hosts, still loading PHP 5.3 while if I create new virtual hosts, they are now using PHP 5.5.

Which place do I need to configure?

-Using NGINX with official module (Apache disabled)

PS: This is a dev server, non-production, so please fire away with your suggestions.

Thank you!

// nevermind, got it, php-fcgi processes are the culprit.