Django App Requires Different Version Dependency Than Project

I am currently writing a Django app to integrate into a larger project. For the app, I need some python package (call it 'package-a') with version 1.0. However, the project that I am trying to add the Django app to already requires package-a, but with version 1.2. The functionality that I need in my app is only available in version 1.0.

Is there a way to add this app to the project with version 1.0 of package-a while the main project still uses version 1.2?