shinyapps.io returns: namespace sass 0.3.1 is being loaded, but >= 0.4.0 is required

Posit Professional & Hosted Products shinyapps.io
,
1

I try to install a Shiny app to shinyapps dot io using

library(rsconnect)
setwd("C:\\Users\\DenisCousineau\\Repositories")
rsconnect::deployApp('superb/inst/superbShiny')

However, the bundle reaches shyniapps.io but returns this error message:

namespace ‘sass’ 0.3.1 is being loaded, but >= 0.4.0 is required

I tripled-checked and the version installed on my computer is sass 0.4.0.

Is this error message related to the server shinyapps.io not up-to-date relative to this package? Or is it related to my own installation?