Move the oven rack to the lower third position and heat the oven to 350°F. Wrap the outer bottom of a 9-inch spring-form pan tightly with aluminum foil.
Combine the gingersnap crumbs, sugar, and melted butter. Press the crumb mixture into the bottom and about 2-inches up the sides of the pan.
Bake for 10 minutes. Set aside to cool while you make the filling.