updating a bug "missing required parameter"

Using the call

https://api.leantesting.com/v1/bugs/[bug_id]?status_id=3&access_token=[token_id]

with a "PUT" Method

returns

{"error":true,"error_message":"Missing required parameter.","status":400}

However in the API docs there are no required parameters when updating a bug, and I have included the field and the value that I want to update.