<prompt> Human: I have a USBank Credit Card that I do not use, but it is my oldest line of credit. I got a letter in the mail saying that my cards limit was reduced by half. I dont really care as I do not use that card, but I keep it for the history. Do I need to be worried about that at all? After I got that notice I went out and filled up the cars tank with this card so that it at least was active again, but I do not want to make an inquiry to increase my credit limit with it.  <response>: Do I need to be worried about that at all? After I got that notice I went out and filled up the cars tank with this card so that it at least was active again, but I do not want to make an inquiry to increase my credit limit with it. Not really. Credit card companies can reduce, increase, or revoke your credit whenever they want within certain boundaries. I wouldnt worry about it if youre not using it, though it could affect your credit slightly 