Looks like it hasn't been updated in a while. Wikipedia has us at 26 stars within 12.5 ly now. https://en.wikipedia.org/wiki/List_of_nearest_stars
Notably, Luhman 16, which is just 6.51 ly away, but is so dim and in such a crowded patch of sky it was only discovered in 2013: https://en.wikipedia.org/wiki/Luhman_16