Python can't update "expires_at" in collaboration?

I am trying to update the "expires_at" of collaboration in Python with no success.

## test.py
updated_collaboration = collaboration.update_info(role=CollaborationRole.VIEWER,Expires_at = '2022-07-11T10:00:00-07:00')

>>TypeError: update_info() got an unexpected keyword argument 'Expires_at'<<
##

https://support.box.com/hc/ja/community/posts/360049156054-Extend-collaborations-using-Python-SDK
https://ja.developer.box.com/reference/put-collaborations-id/

I found the above article and would like to know how to update "expires_at" in python.

Thanks,