The vitality of Hadza (ISO639-3: [hts]), a language isolate spoken in Tanzania, has been classified as endangered or vulnerable. The sources for these classifications, however, are based on dated statements or are wholly unknown. This chapter presents a current vitality assessment of Hadza in 15 contemporary Hadza communities east of Lake Eyasi, based on primary fieldwork data through ethnographic participant observation and unstructured interviews in 2018 and 2022. The assessment employs the UNESCO Language Vitality and Endangerment (LVE) framework as a tool for highlighting specific factors which bear implications for the future of Hadza. In particular, a nascent shift in language use from Hadza to the dominant lingua franca Swahili among Hadza children in most communities is reported, indicating disruption of intergenerational transmission for the first time. Based on the vitality factors considered together, the assessment shows that the Hadza language situation is more dire than previously reported, classified as Definitely endangered (3) on the UNESCO LVE scale, and that the language is receding in many Hadza communities.