The latest version of CCleaner was released yesterday. Since CCleaner lacks an internal updater, you'll need to download the current version and install it. No need to uninstall the previous version first. The free version will do for most.
Go here to read more about it: http://www.ccleaner.com/
Or download it here: http://www.filehippo.com/download_ccleaner/
Upgrade and run CCleaner today. Your computer will thank you.