Port Vale are now only out of the play-off places on goal difference following a 1-0 win at Northampton.
Manager John Askey made one change with Cristian Montano coming in for his 100th appearance for the club in place of David Amoo.
The Vale were indebted to goalkeeper Scott Brown who made a number of excellent saves to keep his side in the game.
The only goal of the game came on 72 minutes when David Worrall headed in Tom Conlon's cross at the far post.
The Valiants moved up a place to ninth and are now level on points with seventh placed Cheltenham, who occupy the final play-off place.
John Askey's side are back in action on Tuesday night when they make the trip to Forest Green.