max_attempts is only set on job creation

Hi,
I am using Kue 0.8.9 and my jobs have 5 attempts by default.
When processing a single job on some conditions I want to move the job to a "failed" state where no more attempts should be done. How to do it?

I already tried to manipulate the attempts() (e.g. `job.attempts(1).save()`) but it didn't work.
I had the same result when manipulating the state, _max_attempts, _attempts and so on.

Thanks for your help,
Paulo