Preheat oven to 325°F. Combine graham cracker crumbs, sugar, and melted butter in a bowl. Press into the bottom of a greased 9-inch springform pan. Bake for 10 minutes and let cool.
In a large mixing bowl, beat softened cream cheese until smooth. Gradually add brown sugar and mix well. Add pumpkin puree, eggs, vanilla, cinnamon, nutmeg, ginger, and salt. Beat until smooth.
Pour the filling over the cooled crust. Smooth the top and bake for 50-60 minutes until the center is set but slightly jiggly. Turn off the oven and crack the door open, allowing the cheesecake to cool for 1 hour.
Let the cheesecake cool to room temperature. Spread sour cream over the top and refrigerate for at least 4 hours or overnight before serving.