Like any other piece of consumer hardware that's connected to the internet, the Switch is subject to regular firmware updates which add functionality, fix bugs and introduce exciting new features.
However, what a lot of people don't realise is that alongside these system updates Nintendo often issues firmware updates for accessories, such as Joy-Con and Pro Controllers.
How To Update Your Nintendo Switch Joy-Con
Head into System Settings from the main menu and scroll down the left menu to Controllers and Sensors.
Scroll down the right menu to Update Controllers – press this to download the latest firmware, just in case.
Repeat the process to update your Pro Controller.