Apple has released a new update: iOS 9.3.4. But do you really need it? Touted as a security update, Apple has been relatively vague about what the new iOS upgrade does. Users have noted that it has patched out a popular type of jailbreak, but otherwise doesn't seem to have impacted much on the user side. Because of this, the 9.3.4 update may not be essential for users who aren't overly concerned about their security.