A minor update has been released for users SP (C530X). No notable changes in this update. It seems that the update brings only some minor changes, optimizing the software a bit.
The update has now been taken up Sony OTA system update depending on the region but that can comelater than a few days. If you'd rather not wait for happiness, you can use FlashTool to update. XDA TFT format file by providing the following link. However, you should consider the risk before flash.
Source: Xperiablog, XDA