{\texttt{siunitx}: Launching version 3} {Joseph Wright} {Since it was first released in 2008, \texttt{siunitx} has become established as the major package for typesetting physical quantities in \LaTeX. Following up on my \tug\,2018 talk, I will look at how the update to version~3 has gone now that this is out. I'll briefly look at the background, then consider some of the user and developer efforts that have made the launch a success.}