Stanisław Lem, a philosopher and futurologist, in his many works devoted much attention to the condition of human and the relation between human and technology. He coined the term ‘autoevolution’ in the course of forecasting unlimited technological augmentation of human abilities. Nowadays, the term may be associated with the conceptions presented by transhumanism, a 20th-century-born philosophical movement which advocates radical transformation of Homo sapiens by means of the achievements of scientific and technological progress. Lem’s attitude towards such a transformation of human is complicated yet ultimately critical due to the fact that it poses a threat to human culture as such. The phenomenon of autoevolution undermines existing values and raises a question of authenticity of a future posthuman. We examine dependence between technology and culture, present Lem’s conception of autoevolution and his philosophy of culture, then we sketch a post-metaphysical dispute about authenticity, and finally show that Lem’s thought ­belongs to one of the arguing sides.