upgrader in flutter don't have update on play store?

Question

I am using upgrader in flutter to upgrade the app from play store. Its redirecting to the play store if new version available, But The play store don't shows the update option, it shows the "uninstall" and "open" button instead of "update"

I have updated the new version in pubspec.yml also.

Using like in main.dart file

return GetMaterialApp(
  title: 'Spindle',
  debugShowCheckedModeBanner: false,
    home: UpgradeAlert(upgrader: Upgrader(), child: const Home()),
);