In the 35 years since the first model was introduced, the Roadster has continued to consistently pursue "Jinba Ittai (oneness between car and driver)" and "lots of fun" without wavering. In 2023, the fourth-generation Roadster underwent its first large-scale product refreshment, focusing on "the evolution of the feeling that people enjoy the car = the evolution of the ‘Kan' (Sense)". In this product improvement, to respond to recent demand for safe and environmentally friendly car manufacturing, advancements were made to comply with the Cyber Security regulation, which is an international legal regulation, and advanced safety equipment has evolved. In this article, we will introduce an overview of the major product improvements for the Roadster.