Constraints on the decay of ^180mTa

^180mTa is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known beta and electron capture decays due to the large K-spin differences and small energy differences between the isomeric and lower energy states. Detecting its decay presents a significant experimental challenge but could shed light on neutrino-induced nucleosynthesis mechanisms, the nature of dark matter and K-spin violation. For this study, we repurposed the Majorana Demonstrator, an experimental search for the neutrinoless double beta decay of ⁷⁶Ge using an array of high-purity germanium detectors, to search for the decay of ^180mTa. Over 17 kilograms was installed within the ultra-low background detector array. We present results from the first year of Ta data and provide an updated limit for the ^180mTa half-life. With new limits >1.5 x 10¹⁹ years, we improved existing limits by one to two orders of magnitude. We gratefully acknowledge support from the Department of Energy through the Los Alamos National Laboratory's Directed Research and Development Program, the DOE Office of Nuclear Physics, the Particle Astrophysics and Nuclear Physics Programs of the National Science Foundation, and the Sanford Underground Research Facility.