You can configure the CPAN shell to uninstall outdated modules like so: 
cpan> o conf mbuild_install_arg UNINST=1
cpan> o conf make_install_arg '--uninst 1'
Or follow the prompts: 
cpan> o conf init

In reply to Re: Upgrading Core Modules Using CPAN - Best Practice? by mattk
in thread Upgrading Core Modules Using CPAN - Best Practice? by stocks29

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