The 19-year-old defender on Tuesday joined fellow Leith youth-team recruits David Gold, Paul Grant, Dean Horribine and Euan Smith in agreeing new one-year contracts. Centre-back Forster made his first-team debut in the Edinburgh derby win at Hearts last month and deputised for injured skipper James McPake in the 3-0 Scottish Cup final defeat to Celtic.
He said: "The past couple of months has been absolutely unbelievable for me and I can't wait to kick on and progress even further next season."
Forster added: "It just goes to show that if you work hard then you do get your rewards - I went from being a long way from a first-team start to playing in an Edinburgh derby and a Scottish Cup final.
"I love playing for Hibs and I'm looking forward to helping the team to win matches next season."
Midfielder Gold, 20, has captained the Under-20 team for the past two seasons while Horribine, 20, made his first-team debut in the penultimate game of the Scottish Premier League season when he came on as a substitute at Kilmarnock.
Horribine said: "I'm delighted to be at Hibs for another year. Hopefully I can kick on and become a first team player next season."
Goalkeeper Grant, also 20, made his first start for Hibernian at top-team level away to Inverness Caledonian Thistle 12 months ago and attacking midfielder Smith, 19, spent the second half of the season out on loan at Arbroath, scoring twice in 14 appearances.
Boss Pat Fenlon hailed his academy graduates - who are all from Edinburgh - saying: "I'm a firm believer that home-grown players absorb a club's culture and represent its future.
"Alex Harris, Jordon, Danny Handling and Ross Caldwell all made contributions to the first team during the final few months of last season. Their progress will inspire other young players to try to do something similar and hopefully help them to recognise that when they're given a chance they need to seize their opportunity."