Mix flour, yeast, salt, and water in a bowl.
Let the dough rest for about 20 hours for proofing.
Preheat a cast-iron Dutch oven for 30 minutes before baking.
Place the dough in the preheated Dutch oven.
Bake for 15 to 20 minutes.
Remove the bread from the Dutch oven for the last 10 minutes to achieve a golden color.
