How to change app version
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Go to pubspec.yaml 
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EX. Update version:A.B.C+X in pubspec.yaml. 
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For Android: A.B.C represents the versionName such as 1.0.0. X (the number after the +) represents the versionCode such as 1, 2, 3, etc. 
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Do not forget to execute flutter packages get, flutter build or flutter run after this step  
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For iOS A.B.C represents the CFBundleShortVersionString such as 1.0.0. X (the number after the +) represents the CFBundleVersion such as 1, 2, 3, etc. 
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Do not forget to execute flutter packages get, flutter build or flutter run after this step  
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Additional iOS Build Settings: - Open your iOS project in Xcode
- Go to Runner -> Build Settings
- Search for "FLUTTER_BUILD_NAME" and "FLUTTER_BUILD_NUMBER"
- Update these values to match your desired version
 