Preheat oven to 350 degrees F (175 degrees C). Grease a 9-inch pie pan.
In a medium bowl, mix together the graham cracker crumbs, melted butter, sugar and cinnamon. Press into the bottom and up the sides of the prepared pie pan.
In a medium bowl, mix together the condensed milk, corn syrup and vanilla. Pour into the crust.
Bake in preheated oven for 15 minutes. Cool before serving.