Well, the good thing is all those old versions of modules are archived[1] and you can still get them if you really need to, and there are utils to spider the de

Well, the good thing is all those old versions of modules are archived[1] and you can still get them if you really need to, and there are utils to spider the dependency chain and tell you the packages and versions (and I think stuff that will make sure those versions get fetched) on CPAN itself, so it shouldn't be too hard to get the prior stuff up and running if you go that route (even if it might have security implications). The only stuff it would be hard to back down in versions would be core stuff, but I'm not aware of any core Perl modules that have had breaking API changes. 1: http://backpan.cpantesters.org/ http://backpan.cpantesters.org/ Edit: Cleaned up an ambiguous sentence in the middle there.