Adding repo from ropensci

I am trying to take a snapshot of my project that includes the following package

install.packages("rnaturalearthhires", repos = "http://packages.ropensci.org", type = "source")

Unfortunately, when I run packrat:status(), I get the following error

Error: Unable to retrieve package records for the following packages:
- "rnaturalearthhires

Do you know how I could add this repo so I can add this package to my snapshot?

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