Dependabot

https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file

version: 2
updates:
- package-ecosystem: bundler
  directory: "/"
  schedule:
    interval: weekly
  ignore:
    - dependency-name: "rack"
      versions: ["3.1.x"]