What concurrency issue?
If you want to be sure that you have the same version of modules on the development box as on the production box, you need to keep local copies somehow. Setting up your own CPAN mirror would also work.
You may not think you'd want this, but there several useful CPAN modules that have occasional backwards-incompatible changes. Hoping you won't run into that isn't nearly as effective as making sure it won't bite you.
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