I dont know if they have updated modules for both or not but I know I couldn't run apache 2.3.3 and/or php 5.20 because of incompatibility of the most popular and most needed modules on both.
I think Apache 2.0.59 and php 5.16 is good for now. I know there wasn't many security fixes for it seeing as the open base dir and safe mode bypasses still work from what I hear. I know I am using the suhosin extension from hardened-php.net and I wasnt able to exploit it. That suhosin has some killer options but incompatible with some sites. It has a cookie encryption variable where someone could not add your info to a cookie and login, some pretty cool stuff, go check it out