"Please update to the latest available on CRAN"

I have a shiny app on shinyapps.io that I have been updating (republishing) every month for over two years with no problems. While doing my latest republishing today, a little yellow box appeared that said "Please update to the latest available on CRAN". So I updated RStudio and all of the packages I use and tried again, but the yellow box just reappeared. It will not allow me to republish, but I don't understand what, precisely, I am being requested to update on CRAN. Any advice on how to proceed would be appreciated.


I am having this same issue.

Just started happening to an app I have been updating weekly for a few months.

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