The package is no longer available on CRAN

[cosmin-novac]

CRAN says the package was taken down recently. Installing from github also fails with "package 'rvest' was built under R version 3.6.3"

[larry77]

I can install from github (try updating rvest on your machine), but it is true that the package is not available for the latest R (4.1.0 (2021-05-18) at the moment of writing) from CRAN.