This article analyzes the educational mismatch in the city of Cali, Colombia, using the evolution of diploma requirements reported in the classified advertisements published in El País, the city’s main newspaper, as basis. We built a time series differentiating between those classified ads requiring a diploma to get the job and those that do not. The tests show that the series has a unit root, so a decomposition analysis to estimate its permanent and transitory component is performed. Our results suggest that the labor market in Cali is quite credentialist, as diplomas are required regularly for access to a vacancy. This situation affects the labor market match and delves into educational mismatches because firms prefer the credentials of Cali workers.