Compatible versions of firebase_auth and cloud_firestore?

[siraben]

I was working on migrating my Flutter project to null safety, but the version constraint solver failed:

Because cloud_firestore >=0.17.0-1.0.nullsafety.0 depends on firebase_core_platform_interface >=4.0.0-1.0.nullsafety.0 <4.0.0-2.0.nullsafety.0 and firebase_auth >=0.21.0-nullsafety.0 depends on firebase_core_platform_interface ^4.0.0-nullsafety.0, cloud_firestore >=0.17.0-1.0.nullsafety.0 is incompatible with firebase_auth >=0.21.0-nullsafety.0.
So, because myapp depends on both firebase_auth ^0.21.0-nullsafety.0 and cloud_firestore ^0.17.0-1.0.nullsafety.0, version solving failed.

What are the compatible null-safe versions of firebase_auth and cloud_firestore?