Bailey diagrams of the RR Lyrae stars belonging to UMi. Left panel: the black filled circles mark the Gold sample RR Lyrae; the known and new RR Lyrae members of UMi confirmed in this work are plotted with teal and blue filled circles, respectively. A total of 125 sources are shown in the figure. Right panel: same as in the left panel, but with 62 UMi RR Lyrae stars with photometric metallicities from Muraveva et al. (2024) marked by filled circles colour-coded according to their metallicity, and UMi RR Lyrae members lacking a metallicity value shown by empty circles. Grey points in the background show the all-sky RR Lyrae sample published in the Gaia DR3 vari_rrlyrae table (~270 000 sources).