Tools like Dependabot and PyUp are amazing for automatically keeping dependencies updated. They work fine, as long as your dependencies are distributed via a supported language-specific package manager and specified in a manifest file. This doesn't account for 100% of application dependencies though, particularly when it comes to deployment. This is where Renovate has a killer feature: Custom Managers. The setup is a little fiddly, but this allows Renovate to submit pull requests to arbitrary files like a Dockerfile or an ansible playbook bumping applications like nginx, curl or Postgres which aren't specified in a requirements.txt or a package.json.