  We present a third epoch of Chandra observations of the Type Ia Large
Magellanic Cloud Supernova remnant (SNR) 0509-67.5. With these new observations
from 2020, the baseline for proper motion measurements of the expansion has
grown to 20 years (from the earliest Chandra observations in 2000). We report
here the results of these new expansion measurements. The lack of nearby bright
point sources renders absolute image alignment difficult. However, we are able
to measure the average expansion of the diameter of the remnant along several
projection directions. We find that the remnant is expanding with an average
velocity of 6120 (4900 -- 7360) km s$^{-1}$. This high shock velocity is
consistent with previous works, and also consistent with the inference that
0509-67.5 is expanding into a very low density surrounding medium. At the
distance of the LMC, this velocity corresponds to an undecelerated age of 600
yrs, with the real age somewhat smaller.
