Apple has released an iOS 6 update only aimed at the iPhone 5.

Apple on Thursday released iOS 6.1.4 which delivers an "updated audio profile for speakerphone". And that's about it: there don't appear to be any accompanying security updates to 6.1.4.

The last update, 6.1.3, was released in March and fixed six flaws, four of which were found by the jailbreaking hacking crew evad3rs who used the flaws in a popular jailbreak for iOS 6.0 to 6.2.

Apple engineers are racing to finish iOS 7 to preview it the company's annual Worldwide Developers Conference this June, according to Bloomberg.

iOS 7, along with the next build of Apple's Mac OS X operating system, are expected to be released at the San Francisco event .