Version spectral default ruleset

[markbrockhoff]

Hi,

I use the default spectral oas ruleset to extend it with my own custom rules. I would like to pin a specific version of the default ruleset so that my rules are more reliable and won't change without me being aware of it.
I tried to do this by using unpkg but I always get an error that says "Exports is not defined".

extends:
  - "https://unpkg.com/@stoplight/[email protected]/dist/oas/index.js"

spectral lint -r spectral.yml https://petstore.swagger.io/v2/swagger.json --verbose

Has anyone experience with versioning the default ruleset?