As of today, version 16 of Node.js can be selected in the Node.js Version section on the General page in the Project Settings (newly created Projects will default to the new version).
The new version introduces several new features including:
- ECMAScript RegExp Match Indices
The exact version used today is 16.14.0 and will automatically update minor and patch releases. Therefore, only the major version (16.x) is guaranteed.
Check out the documentation as well.