Rethinking package not installing

Hey, I just installed rstan package and I am trying now to install rethinking (following statistical rethinking book). however, i seem to have missed something because i now get the message that

Error: (converted from warning) package ‘rstan’ was built under R version 3.6.3

Is there a way of installing a previous rstan or a previous rethinking? or what could be the problem? Thanks for any hints!

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If you are using remotes::install_github, then you first need to do


to workaround a bad default.


Thank you, that did it! :)