How do I update devDependencies in NPM?

Question

npm update seems to just update the packages in dependencies, but what about devDependencies.

Right now you can install

Answer 1

If you are using outdated npm version it might be the problem. So before any other commands execute:

sudo npm install npm -g

or (if above doesn't work):

sudo npm update npm -g

Then relaunch the console (in order for changes to take effect). Now you can check your new npm --version and if it is up to date execute:

npm update

or (if you prefer):

npm update --save-dev