how can I update per user session in laravel

hi! I want to get my users session and make some changes and update it again I can get my user's session info from payload field

unserialize(base64_decode(auth()->user()->session->payload))

for example, I want to delete all products from users cart that is stored before in a session but how can update users session after making my changes on user's session? what is laravel encrypt for sessions?