I am trying to run linear mixed effects models with package lme4 in R. I have the most recent versions of R & RStudio, have updated the lme4 package, and continue to get the error that package ‘Matrix’ required by ‘lme4’ could not be found. I am not running into this problem on my personal computer after updating R & RStudio so I’m not quite sure what to do. Any help would be greatly appreciated– thanks in advance!

I have updated everything and expected Matrix to be available, but it is not.

library(lme4)

Error: package ‘Matrix’ required by ‘lme4’ could not be found