He signed a one-year deal, with an option for the club to extend that by a further 12 months.
Iron Boss Brian Laws told BBC Radio Humberside: "He's been a major influence in our midfield this year, and played a key role in our success.
"He and Andy Crosby at the back provide a wealth of experience that's given us a real foundation to build on.
"Ian warrants an extra commitment from us and we're delighted to have him on board for another season."