We will solve today’s problem:
│ [!] Your project requires a newer version of the Kotlin Gradle plugin. │
What appears when we want to generate an APK with Flutter and find out that Kotlin is outdated.

We need to do the following:
Open the file:
android/build.gradle
And search for this line (or if there’s another version):
ext.kotlin_version = '1.7.1'
Replace with (or the current):
ext.kotlin_version = '1.9.23'
And make sure you have:
buildscript { dependencies { classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" }}
Luego en consola:
flutter clean flutter pub get flutter run
