The latest build tools for Android have not replaced many support libraries with androidx versions. See https://developer.android.com/jetpack/androidx/migrate These should be used in place of older android support libraries. However some changes to the gradle.properties file is required to integrate these libraries. The following lines need to be added. android.enableJetifier=true android.useAndroidX=true The only way I can see to include these lines is to export the project and edit the build that way. Does anyone know of a way to edit the gradle.properties file through unity and create from the editor? And failing this, is this something Unity will be working on soon? Changing to Androidx libraries will be very urgent soon. Cheer.