I need to update my Script in WordPress

Hi, I need to update my php to 5.5 version, and HostGator said the following:
The upgrade to php 5.5 has completed at this time. I noticed that your main site, http://www.bowerpowerblog.com/, was not loading. I added php 5.2 as a standalone version on your server and switched it back to 5.2 so that it would load. You will need to upgrade the script to a version that is compatible with php 5.5.
How do I do this, or can you recommend someone to do it for me?
Thanks,

Jeremy