Here is another post from the realm of ultra-lightweight-reproducibility for R:
If are going to get serious about locking down your system then only let it run
on the version of R that you personally used to obtain your results!
It takes very, very little effort:
stopifnot(R.version$major==3 && R.version$minor==1.1)
99% of the time, using a newer version won’t matter, but make it crystal clear
both to yourself and your collaborators how you obtained your results, at least
when it comes to which version of R that you used.