XGBoost on Heroku

Hi, I have incorporated XGBoost into my program and deployed to Heroku but am getting error below. Locally I am running in pipenv and installed XGBoost within that. It did not reflect in pipfile. I tried adding manually but that did not work either. Any ideas? thanks

ModuleNotFoundError: No module named ‘xgboost’

Traceback:

File "/app/.heroku/python/lib/python3.8/site-packages/streamlit/ScriptRunner.py", line 322, in _run_script
    exec(code, module.__dict__)File "/app/mlforecast.py", line 35, in <module>
    from xgboost import XGBRegressor