Using plyr::mapvalues with dplyr

plyr::mapvalues can be used like this:

mapvalues(mtcars$cyl, c(4, 6, 8), c("a", "b", "c"))

But this doesn't work:

mtcars %>%
dplyr::select(cyl) %>%
mapvalues(c(4, 6, 8), c("a", "b", "c")) %>%
as.data.frame()

How can I use plyr::mapvalues with dplyr? Or even better, what the dplyr equivalent?