A university website shows that Penn State was on the hook for about $50.5 million as of July 31, up $2.8 million from two months earlier. The amount covers legal fees, consulting work and other costs.
The university has said it won't use tuition dollars, state appropriations or donations to pay the tab.
The retired assistant football coach was sentenced to 30-to-60 years in prison last year after being convicted on dozens of criminal counts of sexual abuse.
Sandusky's November 2011 arrested triggered a massive scandal that saw the firing of late coach Joe Paterno, criminal charges against three university administrators and NCAA sanctions against the football program.