Fields not required with PUT in rest framework

In my api built with rest_framework (python) I can perform the update of a record however I have to pass all fields that this record has for example if I want to update only the email with record 1 I have to inform all fields in the request, see:

PUT for host: 8000 / user / 1

{
    "name": "Arnaldo Pereira da Silva",
    "department": "Vendas",
    "email": "[email protected]" // antigo email era [email protected]
}

But I would like to send only the data I would like to use as follows:

PUT for host: 8000 / user / 1

{
    "email": "[email protected]"
}

If I try to send only the email I get a message that the other fields are required, how do I inform the rest_framework that I can only update 1 field or that the fields are not mandatory?