I am interviewing for a firm, and am at the final stages of getting an offer. Initially, the HR had asked me for a salary "expectation", to which I quoted a number. However, I have recently been intimated that I will be promoted by my current company in this cycle. That is going to bump my salary up, so I now am looking to expect a higher figure than what I had quoted to the HR. My interviews have gone quite well (not sure if that matters). Also, the HR had told me that it is an "open budget" position, so I can write anything as my salary expectation.
Is it ethical/ok to revise my estimate given the above reason, or will it create issues?