Still not rid of your old box spring mattress? Is the noise bothering you in your sleep? If you aren’t planning on buying a new one at the moment, then there is a quick fix to this. Here’s an advise from Good Housekeeping:

First, check the frame for loose fittings that may need to be tightened or reglued. If the frame is metal, apply a commercial lubricant to the rivets. To quiet squeaks that come from a particular slat, wrap a thin piece of cloth around the end that attaches to the frame. This may lessen the noise. If these tricks don’t work, call an antiques restorer; he may be able to help you solve the problem.