Generally speaking, don't rely on package managers like apt to maintain up-to-date software. I would strongly recommend purging the node/npm combo you installed from apt and following the instructions on nodejs.org to install the latest release.
Generally speaking, don't rely on package managers like apt to maintain up-to-date software. I would strongly recommend purging the node/npm combo you installed from apt and following the instructions on nodejs.org to install the latest release.