TL;DR
# list your outdated packages / check if a specific package is outdated
npm outdated
yarn outdated [package]
# update / upgrade and save changes to package.json
npm update [package] --save|--save-dev
yarn upgrade [package]
# list your outdated packages / check if a specific package is outdated
npm outdated
yarn outdated [package]
# update / upgrade and save changes to package.json
npm update [package] --save|--save-dev
yarn upgrade [package]