The aim of this study was to investigate the stability of anthocyanins in blueberry yoghurts with modified microflora stored for 8 weeks under refrigerated conditions (4℃). The yoghurts analysed differed in the bacterial strains of Lactococcus genera used for modification of microflora of yoghurt produced with traditional yoghurt starter culture. It was shown to be gradually anthocyanins degrading during the yoghurts storage - especially in the first week. After 8 weeks of storage, the highest loss of pigments (over 50%) was observed in yoghurts with the addition of Lactococcus bacteria, while the lowest anthocyanins degradation was recorded for control yoghurt without modification of microflora (39%).