Cannot update NPM from 5.6 to 6.4.1

Everytime I use npm I see this message:Update available 5.6.0 → 6.4.1 Run npm i npm to update Every time I run npm i npm I get: + npm@6.4.1 added 387 packages in 6.771s Then I check npm --version and it says 5.6.0 again.

Submitted September 20, 2018 at 05:37PM by thinsoldier