Deploying Changed Workflow Code

Patching and Worker Versioning: changing code that has been running for months

A Workflow started two months ago may replay against the code you deploy today. You learn both mechanisms — patching inside the code, and Worker Versioning (GA since March 2026) which pins executions to a deployment version and supports ramped rollout and rollback — and how they interact with Continue-As-New.

Estimated time: 90 minutes

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