In Roon, under Settings->About: you will see if your core will have the latest version installed. If not, follow the instructions there.
An iPad app usually follows an update for your core. The build number for the app and the core should be the same. You can also see this on Settings->About.
If the iPad app has a lower build number, you will have to update the app. Usually, this will happen automatically. But you can help this procedure a little by opening the app store on your iPad, search for the app Roon, and then usually it will give you the option to update it.