「Dart 2.13」では、新規にアプリやパッケージを開発する際に健全なnull安全（sound null safety）が既定で有効化された。

Google bumped Flutter, their massively cross-platform app SDK, to version 2.0, adding stable support for web apps and sound null safety.

The latest version of the programming language Dart is now available. Dart 2.12 includes stable versions of sound null safety and Dart FFI.