How to update npm packages to latest version and keep version in package.json?

Question

Node.js

Good afternoon!
Part of package:

"devDependencies": {
    "debug": "2.2.0"
},
"dependencies": {
    "body-parser": "1.13.0"
}

There are new versions, how to update them and write the versions to a file?
Now I'm updating manually, it's not very convenient :(
PS:
Deleting the node_modules folder helped, and the npm update --save and npm update--save-dev commands, which, in theory, were supposed to update packages and prescribe new versions in package.json, without deleting a folder...

Answer 1

npm update --save

Answer 2

npm install [email protected] -g