Setting the version and build number
You can update both the version name and the version code number in the same place in pubspec.yaml. Just separate them with a + sign. For example:
version: 2.0.0+8
This means
- The version name is
2.0.0 - The version code is
8
This is described in the documentation of a new project (but you might have deleted that if you are working on an old project):
The following defines the version and build number for your application.
A version number is three numbers separated by dots, like 1.2.43
followed by an optional build number separated by a +.
Both the version and the builder number may be overridden in flutter
build by specifying –build-name and –build-number, respectively.
Read more about versioning at semver.org.
version: 1.0.0+1
Re-enabling auto versioning
If your Flutter versioning is not automatically updating anymore, see this answer for how to fix it.