Apple has today released iOS 9.3.4. This comes just over two weeks after releasing iOS 9.3.3. In this minor update, we see an important security fix that is recommended for all users. After some searching around, users were able to find that this update brings a fix for the Pangu iOS 9.3.3 jailbreak exploit. Other than that, there is nothing new.
To get this update users can go to Settings > General > Software update > iOS 9.3.4. Or you can download it directly from iTunes.