De Girolamo, 27, joined the Bucks from Matlock Town in February 2018.
He has made a total of 59 appearances for the club, who reached the Premier Division play-offs last season.
Meanwhile, Buxton have added another date to their pre-season schedule.
They will take on Northwich Victoria on Wednesday July 31 at Witton Albion's Wincham Park.
Buxton pre-season games:
Saturday 13th July Cheadle Town Away 3:00
Friday 19th July Conwy Borough Away 7:45
Saturday 20th July Llangefni Town Away 2:30
Wednesday 24th July Trafford FC Home 7:45
Saturday 27th July Glossop North End Home 3:00
Wednesday 31st July Northwich Vics Away 7:45 (at Witton)
Saturday 3rd August Leek Town Away 3:00
Tuesday 6th August Brighouse Town Home 7:45
Friday 9th August Widnes Home 7:45
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