Heinen did not have a contract when the NHL season started but on October 30, 2023, he signed a one-year contract worth $775,000 with the Boston Bruins. He is having a good season, as on the year he has played in 70 games and has scored 16 goals, 19 assists for a total of 35 points, include scoring his first career hat trick on January 20th against the Montreal Canadiens. With his current contract only being for $775,000, he is likely to receive a pay increase, but this still could be a potential signing for the Flyers, especially since he's still only 28 years old and will be 29 when the next season begins. If Heinen does not sign a new contract with the Boston Bruins prior to free agency starting, then we will see if he will be in a Flyers uniform when free agency begins on July 1, 2024.