The experienced goalkeeper is in his second spell at the club, after initially coming through the Academy as a youngster.
Since rejoining in 2021, he finally made his senior debut for his boyhood side later that year, against Young Boys in the UEFA Champions League.
Tom also appeared in the League Cup wins over Charlton Athletic and Nottingham Forest, en route to lifting the trophy in 2023, keeping clean sheets on both occasions.
"I am delighted to continue my stay at my boyhood club," Heaton told club media.