The authoress presents the issue of the Ukrainian dialect of the San river region in the aspect of modern development. The material presented was collected from the oldest and the youngest representatives of the Ukrainian dialect in the villages of Kalników, Gaje, Nienowice and Chotyniec in Poland (Podkarpackie Voivodeship). In the past centuries, the region was inhabited mainly by the population of the Ukrainian origin. Nowadays, the inhabitants of these villages live in the vicinity of Polish dialects. The article is concerned with phonetic features of vowels and consonants, and rules of their articulation. The phonetic and lexical changes that occur in the dialect were shown on the basis of the differences in the pronunciation of the older, middle-aged, and young generations.