The latest version (5.0) of the Fitbit OS and its SDK has been released in September 2020. This release no longer supports Fitbit smartwatches other than the Versa 3 and Sense. Hence, by targeting development only for Fitbit OS 5.0, updates to your app won’t be available for millions of devices. In this article, we describe a solution for targeting both SDK 4.x and SDK 5.x compatible devices, from the same code base, with minimal overhead.