Workers SDK Updates & Release Notes
238 updates curated from 1 source by the Releasebot Team. Last updated: Sep 18, 2026
- Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
Workers SDK adds experimental Build Output container image support, local Flagship flag evaluation for offline development, and improved Preview build handling. It also fixes workflow duration calculations in non-UTC timezones and updates dependencies.
Minor Changes
#15609 1f070c8 Thanks @emily-shen! - Build Containers when emitting experimental Build Output
Wrangler and the Cloudflare Vite plugin now build Dockerfile-backed Container images when experimental Build Output is enabled. Container configs are emitted under .cloudflare/output/v0/containers with local image references, while existing registry references pass through unchanged.
#15329 c4c9b75 Thanks @akshitsinha! - Evaluate Flagship flags locally during development
Flagship bindings now use the local Miniflare store by default in Wrangler and the Vite plugin, keeping development offline and isolated from production flags. Set remote: true on a binding to continue using its remote app.
Use wrangler flagship flags pull <APP_ID> to seed the store from a remote app. Flag management commands also accept --local to read and update the local store directly.
#15701 643e5cc Thanks @WillTaylorDev! - Pass Preview intent to defineWorker and upload its resolved configuration
Preview builds now evaluate programmatic Worker configuration with ctx.isPreview set to true and record that intent in Build Output. The shared Preview uploader deploys the resolved bindings and settings while preserving configured Preview base values when it creates a Preview.
Patch Changes
#15705 a0485d5 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:
Dependency
From
To
@cloudflare/workers-types
^5.20260917.1
^5.20260918.1
workerd
1.20260917.1
1.20260918.1#15587 629ddef Thanks @Kuldeeep18! - Fix duration calculation for running workflow instances, steps, and attempts in wrangler workflows instances describe
wrangler workflows instances describe previously distorted the elapsed duration of in-progress instances, steps, and attempts across non-UTC timezones by stripping " GMT" from toUTCString(), causing new Date(...) to parse the timestamp in the local client timezone. The duration is now correctly computed against the current time.
Updated dependencies [a0485d5]:
Original source
[email protected] - Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
Workers SDK updates Miniflare and Wrangler dependencies, including newer workers-types and workerd versions.
Patch Changes
#15705 a0485d5 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:
Dependency
From
To@cloudflare/workers-types
^5.20260917.1
^5.20260918.1workerd
Original source
1.20260917.1
1.20260918.1 All of your release notes in one feed
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- Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
@cloudflare/[email protected]
Workers SDK adds local Flagship flag evaluation in development with offline Miniflare storage and local flag management.
Patch Changes
#15329 c4c9b75 Thanks @akshitsinha! - Evaluate Flagship flags locally during development
Flagship bindings now use the local Miniflare store by default in Wrangler and the Vite plugin, keeping development offline and isolated from production flags. Set remote: true on a binding to continue using its remote app.
Use
Original sourcewrangler flagship flags pull <APP_ID>to seed the store from a remote app. Flag management commands also accept--localto read and update the local store directly. - Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
@cloudflare/[email protected]
Workers SDK updates dependencies for a patch release, including Wrangler and Miniflare.
- Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
@cloudflare/[email protected]
Workers SDK adds experimental Build Output container builds, evaluates Flagship flags locally by default during development, and improves Preview handling by passing preview intent into configuration and upload flows.
Minor Changes
- #15609 1f070c8 Thanks @emily-shen! - Build Containers when emitting experimental Build Output
Wrangler and the Cloudflare Vite plugin now build Dockerfile-backed Container images when experimental Build Output is enabled. Container configs are emitted under .cloudflare/output/v0/containers with local image references, while existing registry references pass through unchanged.
- #15329 c4c9b75 Thanks @akshitsinha! - Evaluate Flagship flags locally during development
Flagship bindings now use the local Miniflare store by default in Wrangler and the Vite plugin, keeping development offline and isolated from production flags. Set remote: true on a binding to continue using its remote app.
Use wrangler flagship flags pull <APP_ID> to seed the store from a remote app. Flag management commands also accept --local to read and update the local store directly.
- #15701 643e5cc Thanks @WillTaylorDev! - Pass Preview intent to defineWorker and upload its resolved configuration
Preview builds now evaluate programmatic Worker configuration with ctx.isPreview set to true and record that intent in Build Output. The shared Preview uploader deploys the resolved bindings and settings while preserving configured Preview base values when it creates a Preview.
Patch Changes
Updated dependencies [1f070c8, a0485d5, 629ddef, c4c9b75, 643e5cc]:
Original source Similar to Workers SDK with recent updates:
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- Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
@cloudflare/[email protected]
Workers SDK ships a patch update with refreshed dependencies, including miniflare 5.20260918.0-alpha.
- Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
@cloudflare/[email protected]
Workers SDK updates dependencies in a patch release for the latest Miniflare and Cloudflare packages.
Patch Changes
Updated dependencies [a0485d5, c4c9b75, 643e5cc]:
- [email protected]
- @cloudflare/[email protected]
- @cloudflare/[email protected]
- @cloudflare/[email protected]
- @cloudflare/[email protected]
- Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
@cloudflare/[email protected]
Workers SDK updates dependencies, including miniflare 5.20260918.0-alpha in this patch release.
- Sep 18, 2026
- Date parsed from source:Sep 18, 2026
- First seen by Releasebot:Sep 18, 2026
@cloudflare/[email protected]
Workers SDK adds Preview intent handling for defineWorker and uploads resolved Preview configuration, with Preview builds now evaluating worker settings in preview mode and preserving configured base values.
Minor Changes
- #15701 643e5cc Thanks @WillTaylorDev! - Pass Preview intent to defineWorker and upload its resolved configuration
- Preview builds now evaluate programmatic Worker configuration with ctx.isPreview set to true and record that intent in Build Output. The shared Preview uploader deploys the resolved bindings and settings while preserving configured Preview base values when it creates a Preview.
Patch Changes
- Updated dependencies [1f070c8, 1f070c8, a0485d5, c4c9b75, 643e5cc]:
- @cloudflare/[email protected]
- @cloudflare/[email protected]
- [email protected]
- @cloudflare/[email protected]
- @cloudflare/[email protected]
- Sep 17, 2026
- Date parsed from source:Sep 17, 2026
- First seen by Releasebot:Sep 17, 2026
Workers SDK adds support for real-time Issues observability settings, marks Wrangler preview commands as open beta, and expands local Container development with explicit named image selection. It also updates related dependencies.
Minor Changes
- #15684 6874aa9 Thanks @Ankcorn! - Add support for configuring real-time Issues with observability.issues.enabled
Wrangler now validates and uploads the Issues setting alongside the existing logs and traces observability options. The experimental configuration format supports the equivalent observability.issues.enabled option.
- #15681 d96b319 Thanks @podonnell-dev! - Mark wrangler preview commands as open beta
Wrangler now labels Preview commands as open beta in help output and command warnings, matching the feature's public availability.
- #15673 2b39fc2 Thanks @ghostwriternr! - Support explicit named Container image selection in Wrangler local development
Wrangler builds or pulls named images configured through Wrangler JSON or TOML and exposes their local tags through ctx.container.images. Pass one of those references to ctx.container.start({ image }) to select the image.
This extends the experimental Durable Object-managed Containers interface. Named images are opt-in and do not become the Container's default image. A Container without a default image must supply an image or full Container snapshot when starting.
Patch Changes
- #15689 876eea1 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:
Dependency
From
To
@cloudflare/workers-types
^5.20260916.1
^5.20260917.1
workerd
1.20260916.1
1.20260917.1Updated dependencies [2298cf1, 876eea1]:
Original source
[email protected] - Sep 17, 2026
- Date parsed from source:Sep 17, 2026
- First seen by Releasebot:Sep 17, 2026
Workers SDK adds support for named images and no default image in Durable Object-managed Containers, extending Miniflare’s experimental interface. It also updates miniflare, wrangler, workers-types, and workerd dependencies.
Minor Changes
- #15672 2298cf1 Thanks @ghostwriternr! - Support named images or no default image for Durable Object-managed Containers
Miniflare now accepts named image references for Durable Object-managed Containers and preserves an omitted default image (imageName). A Container without a default image must supply an image or full Container snapshot when starting.
This extends Miniflare's experimental Durable Object-managed Containers interface.
Patch Changes
- #15689 876eea1 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:
Dependency
From
To
@cloudflare/workers-types
^5.20260916.1
^5.20260917.1
workerd
1.20260916.1
1.20260917.1
Original source - Sep 17, 2026
- Date parsed from source:Sep 17, 2026
- First seen by Releasebot:Sep 17, 2026
@cloudflare/[email protected]
Workers SDK adds real-time Issues observability support in Wrangler and the experimental config format.
Minor Changes
#15684 6874aa9 Thanks @Ankcorn! - Add support for configuring real-time Issues with observability.issues.enabled
Wrangler now validates and uploads the Issues setting alongside the existing logs and traces observability options. The experimental configuration format supports the equivalent observability.issues.enabled option.
Original source - Sep 17, 2026
- Date parsed from source:Sep 17, 2026
- First seen by Releasebot:Sep 17, 2026
- Sep 17, 2026
- Date parsed from source:Sep 17, 2026
- First seen by Releasebot:Sep 17, 2026
@cloudflare/[email protected]
Workers SDK ships patch updates with refreshed Wrangler and Miniflare dependencies.
- Sep 17, 2026
- Date parsed from source:Sep 17, 2026
- First seen by Releasebot:Sep 17, 2026
@cloudflare/[email protected]
Workers SDK adds explicit named Container image selection in local development
Minor Changes
- #15674 a939a6c Thanks @ghostwriternr! - Support explicit named Container image selection in local development
The Vite plugin builds or pulls named images from Wrangler configuration and exposes their local tags through ctx.container.images. Pass one of those references to ctx.container.start({ image }) to select the image.
This extends the experimental Durable Object-managed Containers interface.
Patch Changes
Updated dependencies [6874aa9, 2298cf1, d96b319, 876eea1, 2b39fc2]:
Original source
Curated by the Releasebot team
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