Preheat the oven to 180°C.
Mix blueberries with sugar and lemon juice and place them in a baking dish.
Combine flour, almond flour, sugar, and salt in a bowl, then cut in cold butter and mix by hand until crumbly.
Spread the crumble dough evenly over the blueberries.
Bake in the oven for 25–30 minutes.