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What is Dependabot auto-merge and how do you configure it?

Auto-merge lets Dependabot pull requests merge automatically once they satisfy defined conditions (typically: all required status checks pass), without a human needing to manually click "merge" for every routine, low-risk update — commonly implemented via a GitHub Actions workflow that listens for Dependabot PRs and merges them if specific criteria (like "patch-level update only") are met.

#  .github/workflows/dependabot-auto-merge.yml
on: pull_request
permissions:
  pull-requests: write
  contents: write
jobs:
  auto-merge:
    if: github.actor == 'dependabot[bot]'
    steps:
      - uses: dependabot/fetch-metadata@v1
        id: metadata
      - if: steps.metadata.outputs.update-type == 'version-update:semver-patch'
        run: gh pr merge --auto --merge "$PR_URL"

This is most safely applied to low-risk update categories (patch versions, dev dependencies) where the likelihood of a breaking change is low and CI passing is a reasonably strong signal of safety, rather than blanket auto-merging every Dependabot PR regardless of how significant the version bump actually is.

What does auto-merge let a Dependabot PR do?
What update category is generally the safest fit for auto-merge?

More Related questions...

What is Dependabot? What is the purpose of Dependabot in software development? What are the main features of Dependabot? What is Dependabot version updates? What is Dependabot security updates? How do you enable Dependabot on a GitHub repository? What is the dependabot.yml configuration file? Where is the dependabot.yml file located in a repository? What ecosystems does Dependabot support? What is a package manager in the context of Dependabot? How does Dependabot detect vulnerable dependencies? What is a Dependabot alert? What is the difference between a Dependabot alert and a Dependabot pull request? How do you view Dependabot alerts in a GitHub repository? What permissions are needed to configure Dependabot? What is the dependency graph in GitHub, and how does it relate to Dependabot? What triggers Dependabot to create a pull request? How do you configure the schedule for Dependabot version updates? What is a target-branch in Dependabot configuration? How do you limit the number of open pull requests Dependabot can create? What is a "grouped update" in Dependabot? How do you ignore specific dependencies in Dependabot configuration? What is the difference between Dependabot version updates and Renovate (as a general concept)? How do you close or dismiss a Dependabot pull request? What is Dependabot auto-merge and how do you configure it? What GitHub Actions workflow permissions are needed for Dependabot auto-merge? How does Dependabot handle semantic versioning ranges when proposing updates? What is the difference between Dependabot's "patch", "minor", and "major" update strategies? How do you configure Dependabot to update only patch and minor versions, not major? What are Dependabot's rate limits, and how might they affect large monorepos? How do you configure Dependabot for a monorepo with multiple package ecosystems? What is the "vendor" option in Dependabot configuration, and when is it needed? How does Dependabot handle private package registries/dependencies? What is the difference between Dependabot's GitHub-native version and Dependabot as used via GitHub Actions? How do you configure commit message customization for Dependabot pull requests? What is a "reviewers" or "assignees" configuration option in Dependabot, and why use it? How does Dependabot interact with lock files (e.g., package-lock.json, Gemfile.lock)? What is a CVSS score, and how does Dependabot use it to prioritize security updates? How do you troubleshoot a Dependabot pull request that fails CI checks? What is the "Dependabot secrets" feature, and when is it needed? How do you allow Dependabot to access private registries requiring authentication? What is a "cooldown" period in Dependabot configuration, and why would you use one? Explain the internal workflow of how Dependabot generates a pull request from detecting an outdated dependency? How do you troubleshoot Dependabot silently failing to open pull requests? What are the security implications of enabling Dependabot auto-merge without proper review gates? How can you optimize Dependabot configuration to reduce pull request noise across a large organization? Why might Dependabot updates break a build even when following semantic versioning correctly? Explain how Dependabot's dependency graph integrates with GitHub's Advanced Security features? What is the difference between running Dependabot updates involving custom registries versus fully public dependencies? How do you design an organization-wide Dependabot governance policy across many repositories?
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