Pratt, 25, has scored 42 goals in 127 appearances since arriving at the club from Trafford in 2017.
Manager David McGurk said: “Pratty is the first of many to commit for the 2021/22 season. He is our skipper and has been pivotal to everything we’ve done since he joined.
“We’ve had to fend off interest in him which happens with any good player but I’m delighted that he’s agreed to work with us next season.
“We’ve had really positive talks with the players. I’m hoping to announce more deals over the coming days and months.
“I’m looking at adding five or six players to the group but we have players within the group who will be like new signings as they haven’t played a league game for us yet with the COVID situation.”
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