Precision measurements of the free neutron lifetime τ n , when combined with measurements of the axial vector form factor, can be used to test unitarity of the CKM matrix. Non-unitarity is a signal for physics Beyond the Standard Model (BSM). Sensitivity to BSM physics requires measurements of τ n to a precision of 0.1 s. However, the two dominant techniques to measure τ n (colloquially beam and bottle measurements) disagree by nearly 10 s. UCNτ is a neutron lifetime experiment using a magneto-gravitational trap and an in-situ neutron detector. Neutrons in this trap are not susceptible to loss on material walls as in previous bottle measurements. Additionally, the in-situ detector allows spectral monitoring of the trapped Ultracold Neutrons. In this talk, I will present our most recent result -τ n = 877.7 ± 0.7 (stat.) + 0.4/ − 0.2 (sys.) s. I will also present Monte Carlo simulations of systematic effects in the experiment including heating and spectral cleaning.