The alpine environment has faced significant changes in the last decades. The main drivers are considered climate and land use changes, especially grazing cessation. It is reflected also in vegetation changes, when species from lower altitudes migrate upwards and species with narrow ecological valence and weak competitors are under the pressure of competitively stronger species. In this article, we studied this issue with focus on some endemic species in the highest Western Carpathian Mountains, which include Western, High and Low Tatras at the altitudes ranging from 1510 to 2125 m a. s. l. The research is based on pairwise comparisons of 121 historical phytocoenological relevés sampled in 1970–1983 and recent (original) data sampled in 2016–2022. The main results include: i) despite we recorded the decrease in the species number, when 175 taxa in historical dataset dropped to 134 in recent dataset, both Shannon-Wiener index and average number of species have not significantly changed in the studied plots; ii) general changes in the studied plots are expressed by increase in stronger competitors (mainly Luzula alpinopilosa ssp. obscura and Aconitum firmum ssp. firmum) and, on the other hand, by decrease in weak competitors, especially small-sized Soldanella carpatica, when along with significant decrease in its frequency in all studied vegetation types also decrease in its average nonzero abundance were found; iii) on the vegetation level, the biggest changes were found for Festucion versicoloris alliance.