Hi leandrogcompxeon, welcome to Thunkable! 
Be sure to check out How to ask Great Questions v2.0, the Community Guidelines, and our Getting Started Guide to make the best of your Thunkable Community experience!
To update your app to be built with the latest SDKs, API Levels, or Android OS, you can just send an update to your app on the Google Play store. This will automatically update all of those.