Migrating to Cloudflare Workers wrangler@4.117.0
Version wrangler@4.117.0 introduces 1 breaking change. This guide details how to update your code.
Released: 7/31/2026
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Breaking Changes
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Migration Steps
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Affected Symbols
⚠️ Check Your Code
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unstable_getMiniflareWorkerOptionsBreaking Changes
●Issue #1
The `containerEngine` option has been removed from the worker options returned by `unstable_getMiniflareWorkerOptions`. If you were previously using this option to configure the container engine for a specific worker, you should now set `containerEngine` at the top level when creating a Miniflare instance.
Migration Steps
- 1If you were using `containerEngine` with `unstable_getMiniflareWorkerOptions`, move the `containerEngine` configuration to the top level when creating a Miniflare instance.
Release Summary
This release updates Miniflare to version 5.20260730.0-alpha, which includes changes to local testing paths and the removal of `containerEngine` from worker options.
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