Revs increase when changing gear

[Splay1997]

Hello All,

I have a Seat Ibiza 1.2 2008 6L. I have had a problem with my revs when changing gears for the past couple days since my car has come out of the garage for suspension work. The problem is when I am changing gears, the RPM increases for a second and then drops down to normal. The car is accelerating fine as it has done for the past three years I have had the car.

Any suggestions as to what this fault may be?

Thank you all