  Extreme mass-ratio inspirals (EMRIs) are one of the most highly anticipated
sources of gravitational radiation novel to detection by millihertz space-based
detectors. To accurately estimate the parameters of EMRIs and perform precision
tests of general relativity, their models should incorporate self-force theory
through second-order in the small mass ratio. Due to their extreme mass ratio,
EMRIs inspiral slowly when sufficiently far from merger. As such, the slow
evolution of the first-order metric perturbation contributes to the source for
the second-order metric perturbation, and must be accounted for in EMRI
waveform models. In this paper we calculate the slow evolution of the
first-order metric perturbation in the Lorenz gauge for quasicircular orbits on
a Schwarzschild background in the frequency domain. Lorenz gauge solutions to
the first-order metric perturbation and its slow evolution are obtained via a
gauge transformation from Regge-Wheeler gauge solutions. The slow evolution of
Regge-Wheeler and Zerilli master functions, in addition to a gauge field are
determined using the method of partial annihilators.
