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Can't use the newest npm when node is installed with brew (MacOs)

Even though I installed and reinstalled node with brew, with last versione 11.8.0, apparently it kept using the last version fdecollibus$ npm install --global gatsby-cli npm WARN npm npm does not support Node.js v11.8.0 npm WARN npm You should probably upgrade to a newer version of node as we npm WARN npm can't make any promises that npm will work with this version. npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9. npm WARN npm You can find the latest version at /usr/local/Cellar/node/11.8.0/bin/gatsby -> /usr/local/Cellar/node/11.8.0/lib/node_modules/gatsby-cli/lib/index.js + gatsby-cli@2.4.8 npm -v gave me back version 5.6.0. I've therefore noticed that  /usr/local/lib/node_modules had wrong permissions assigned to root:wheel. A chown did not fix the problem: I've had to manually delete the content of the folder (cd / usr/local/lib/node_modules and -careful - type rm -rf
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