How do you troubleshoot a Dependabot pull request that fails CI checks?

A Dependabot PR failing CI generally falls into one of a few common categories, and working through them systematically is more effective than guessing.

1. Genuine breaking change — the new dependency version actually changed behavior your code depends on; check the dependency's changelog/release notes for the version range being bumped through.
2. Flaky/unrelated test failure — re-run the failed CI job to rule out an intermittent, unrelated issue before assuming the dependency update itself is at fault.
3. Missing secrets/permissions — since Dependabot-triggered workflow runs have restricted access to secrets by default, a CI job that legitimately needs a secret might fail specifically because of that restriction, not because of the actual dependency change.
4. Transitive dependency conflict — the update might have shifted a transitive dependency's resolved version in a way that conflicts with another direct dependency's requirements.

Reading the actual CI failure log carefully to distinguish which category applies is the key first step, since the fix (code changes for a genuine breaking change, versus a workflow permission fix, versus simply re-running for flakiness) differs substantially between them.