Nokia Mobile started releasing the October 2019 update for Android GO running Nokia 2.1. The Nokia 2.1 is currently running Android 9 Pie GO Edition of Google’s smartphone OS and is scheduled to receive Android 10 GO in the first half of next year.
The update for 2.1 is 102.2MB in size. The official changelog mentions only the security patch for October. If you want to check if an update is available for your device, head to Settings->System->System update.