A warning in tidyverse tibbles

I get a warning when I use tibbles and don´t store the results in an object.

   library(tidyverse)
   a <- tibble(b = runif(100), c = rnorm(100))
   a
   # The warning does NOT appears if the result is stored in an object
   b <- a
   #  and if I use data.frames
   head(as.data.frame(a))

The warning I get is this:

I use Windows. A colleague of mine, using linux, does not get this warning.
Does anyone knows the reason. I have not found it!
Thanks a lot.

This was apparently fixed a few days ago, so upgrading should do it

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Upgrading did it!
Thanks a lot!