That single change broke the guarantee you thought you had — the guarantee that your compliance rules were locked, enforced, and permanent. This is why compliance as code loses trust without immutability. If your compliance definitions can mutate after deployment, they are no longer compliance. They are suggestions.
Compliance As Code Immutability means your rules are written once, stored in a verifiable state, and never changed without full traceability. It closes the gap between signed-off security policies and real, running systems. No quiet overrides. No unnoticed edits. What you approve is what runs — and that’s what auditors see.
When compliance rules are immutable, your infrastructure can be audited at any point in time with cryptographic certainty. Past states are preserved. Violations are obvious. History is defensive armor, because any tampering leaves a trail. Immutable compliance code also scales better, because you are no longer fighting the drift between declared policies and deployed reality.