Dash app stops working on Heroku when Store storage_type is set to 'session'

I’m getting H14 warnings on Heroku so I’m trying to limit the memory usage. One attempt was to store the dataframe in a local store object. This works running the app locally, but it stops working when deployed on Heroku. If anyone has any tips as to why that would be very useful thank you.

 dcc.Store(id='dataframe', storage_type='session'),