How do you verify your video course stays in sync with your source documents?

This is a problem I have run into with document-based course series. You have a 20+ module video course originally produced from your source material. Then the source material changes — a syllabus gets updated, a regulation shifts, you find an error in your documentation.

How do you make sure the video matches the updated document without manually re-watching every module? For anyone working on exam prep, certification, or compliance SOPs where accuracy matters, how do you handle this?

Manually reviewing every video each cycle takes too long. Skipping it risks outdated content misleading learners.