Android

You should be changing your versionCode and versionName in android/app/build.gradle:

android {

    defaultConfig {

        versionCode 1
        versionName "1.0"

        {...}
    }

    {...}
}

The versionCode has to be in an integer that is larger than the ones used for previous releases while versionName is the human-readable version, as it will be shown to users. So use something readable and understandable like what is the main purpose for the release.

iOS

Using Xcode:

You will need to change an iOS project's target target iOS version. XCode > Project Navigator > "General" tab > Deployment Info > Target.

This can be either under Target or Identity section.

Using react-native code:

Go to ios folder and then go to Podfile. At the top, you will find the ios version, there you can change it manually.

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