The England and Lions international had two seasons to run on his current four-year contract, and the new package has added an extra year.
Vickery, who has made more than 120 appearances for the Kingsholm club, returned to first team duties on Sunday with a full 80 minutes after missing the last six weeks with a blow-out fracture around the eye area.
Commenting on http://www.gloucesterrugbyclub.com/ director of rugby Nigel Melville said: "It was great to have Vicks back involved on Sunday. He brings massive experience and leadership to the squad, and the new contract means he'll be part of the set-up here as we continue to develop.
"I believe that we've still to see the best of him. I said last week I'd never seen him train so hard as he has done, and that's great news for both Phil and us.
"He's got some great years ahead of him and we're pleased that those will be spent here at Kingsholm."
Vickery, who made his debut for Gloucester in the 1996/97 season, added: "I'm pleased my future is at Kingsholm. It's been a mixed season so far what with injuries and team results, but I want to be part of where this club is going, and it's now the start of a mission for us.
"We know how important Friday's game is, and that is followed by a Powergen Cup quarter-final and then key Premiership games. We know what we've got to do in the next few months."
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