Abstract : Development of new insulins aims to mimic in a better way the natural physiology of this hormone secreted by the pancreas. Rapid insulin analogues have proven a better capacity to reduce postprandial glycaemic peaks after eating. Nevertheless, these molecules are still quite inaccurate to limit glycaemic excursions after the meals. This reality is often described by patients using continuous glucose monitoring systems. So, there is undeniably a place for even more rapid insulins. The ones named «ultra-rapid insulin» tend to better control hyperglycaemia after meals thanks to more favourable profiles regarding pharmacodynamics and pharmacokinetics. Ultra-rapid lispro (URLi) Lyumjev®, is the new ultra-rapid insulin available in Belgium. This review aims to describe its advantages compared to some other rapid insulins thanks to data obtained from trials in type 1 and type 2 diabetes.