Required Kotlin version


To build a Flutter app for Android, Kotlin 1.5.31 or greater is required.

If your app uses a lower version, you will receive the following error message:

┌─ Flutter Fix ────────────────────────────────────────────────────────────┐
│                                                                          │
│ [!] Your project requires a newer version of the Kotlin Gradle plugin.   │
│ Find the latest version on                                               │
│, then update │
│ <path-to-app>/android/build.gradle:                                      │
│ ext.kotlin_version = '<latest-version>'                                  │
│                                                                          │


Flutter added support for foldable devices on Android. This required adding an AndroidX dependency to the Flutter embedding that requires apps to use Kotlin 1.5.31 or greater.

Description of change

A Flutter app compiled for Android now includes the Gradle dependency androidx.window:window-java.

Migration guide

Open <app-src>/android/build.gradle, and change ext.kotlin_version:

buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.5.31'


Landed in version: v2.9.0 beta
In stable release: 2.10


Relevant PRs: