Problem after updating RStudio and R

Hello,
I am trying to load an excel file in R using readxl . I used to load without problems. Now, after updating R, I keep getting this message:

Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) :
there is no package called ‘pillar’

I tried

install.packages("devtools")

devtools::install_github("r-lib/pillar")

and it does not work

Thank you

Can you be more specific? What is the error message you get?

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