You can surely upgrade your existing app right away with Flutter 2.0.
Read moreHow do I update all flutter packages to latest version?
Go to https://pub.dartlang.org/packages and find the latest package from there. In there you can see an install tab. click that. Now you can add the dependencies into your pubspec.
Read moreWhat is the latest version of Flutter SDK?
May 6, 2020, Work-From-Home Edition: 1.17 release. Flutter 1.17 is live! For more information, see Announcing Flutter 1.17.
Read moreWhat is latest flutter stable version?
By default, when you create a new app, Flutter defaults to support the latest version of Android, version 12 (API level 31).3 Şub 2022
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