[Flutter] i am trying to run app with firebase but I am facing this problem

• What went wrong: Execution failed for task ':approcessDebugMainManifest'.

Manifest merger failed : uses-sdk:minSdkVersion 21 cannot be smaller than version 23 declared in library [:firebase_auth] E:\flutter_projects\flutter_application_1\build\firebase_auth\intermediates\merged_manifest\debug\AndroidManifest.xml as the library might be using APIs not available in 21 Suggestion: use a compatible library with a minSdk of at most 21, or increase this project's minSdk version to at least 23, or use toolsverrideLibrary="io.flutter.plugins.firebase.auth" to force usage (may lead to runtime failures)
​

what should i do and tried to add this code but also not working android {
defaultConfig {
minSdkVersion 23
} }

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