ABSTRACT: The aim of this paper is to reexamine the importance of Rip van Winkle’s case for the problem of cognitive dynamics. First I shall present the main problem of cognitive dynamics. Then I shall explain the relevance of Rip’s case to this problem. After that I shall provide a short presentation of the main solutions to this problem. I shall explicate the problem concerning the manner in which philosophers who propose those solutions defend their response to the question of Rip’s case. My argument shall be that they defend their response either in overly dogmatic or in circular way. Finally, I shall suggest a way out of that problem.