API to do bulk update

Hi Team,

I am trying to do a bulk update using the API

host/attask/api/v15.0/task?method=PUT&updates=[{"ID":"565656565656","name":"4051824"}, {"ID": "121212","name":"adadfa sdfad"}]&apiKey=1212121@method=PUT

Note. both task id's exist in Workfront

but I am getting below-error

{

"error":{
"message":"Must specify an id to edit"
}
}

However, I've observed that the Workfront API permits only 4 records at a time for bulk updates. Is there a method to increase the batch size beyond 4 records? Basically, I am trying to update the task name and its custom form fields. There are 12 tasks and each task has a custom form with at least 30 fields in it.

Thanks in advance