How can I upgrade react-native gradle version
In android/build.gradle you have to edit this line
classpath 'com.android.tools.build:gradle:x.y.z'
Change x.y.z with the version you want. Edit it with Android Studio then click Sync now
In {yourProject}\android\gradle\wrapper\gradle-wrapper.properties, update:
distributionUrl=https\://services.gradle.org/distributions/gradle-{your version}.zip
Find your version of gradle with
gradle --version
You may need to install gradle wrapper if you haven't already.
you can go to https://services.gradle.org/distributions/ and check that latest -all.zip version of gradle and update the same in your gradle-wrapper.properties
file. When you run your react-native app the next time, your gradle will first get upgraded and then run.