$ dart pub outdated

Package Name  Current    Upgradable  Resolvable  Latest

direct dependencies:
args          1.4.4      1.6.0       1.6.0       1.6.0
http          0.11.3+17  0.11.3+17   0.12.1      0.12.1  
path          1.6.2      1.6.2       1.6.2       1.7.0   

dev_dependencies: all up-to-date

transitive dependencies:
meta          1.1.6      1.1.6       1.1.6       1.1.8   

transitive dev_dependencies: all up-to-date

1 upgradable dependency is locked (in pubspec.lock) to an older version.
To update it, use `dart pub upgrade`.

1 dependency is constrained to a version that is older than a resolvable version.
To update it, edit pubspec.yaml.