Stirling County scrum-half Sean Kennedy will take one of the four spare places in Edinburgh's elite development programme after his cousin Grant Gilchrist earned a full-time contract.
Kennedy, 21, who was formerly in the programme at Glasgow, comes in along with Heriot's scrum-half Sam Hidalgo-Coyne, who spent last season with Scotland Sevens.
Alex Allan, 20, comes in from Loughborough Students and fellow prop Phil Cringle, 18, arrives from Kirkham Grammar School.
Centre Matt Scott, lock Gilchrist, stand-off Harry Leonard and scrum-half Alex Black were all promoted to the senior ranks from the 11-strong youth ranks. Gilchrist and Scott were the first two players to be capped for Scotland while on the programme.
Elite development coach Bryan Easson said: "Matt Scott's been capped, Harry Leonard has played Heineken Cup rugby at stand-off aged 19, Grant Gilchrist has been an unsung hero of the programme - starting all of our European matches - while Robin Hislop has been involved in 12 games - impressive for a prop aged just 19.
"This season's group has set the bar very high. The opportunity and expectation now rests with a new group of players who fully understand what is required and what can be delivered by this programme."