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Deno’s entire team is joining Cloudflare, with a plan to combine Deno’s celld project and Cloudflare’s workerd runtime to make applications built with Workers and Durable Objects easier to run on self-managed infrastructure. The announcement describes a team joining and a technical collaboration; it does not disclose a purchase price or other financial terms. The move also sets out transition plans for Deno’s runtime, Deno Deploy, and JSR.
What did Cloudflare and Deno announce?
On October 9, 2026, Deno founder Ryan Dahl announced that the entire Deno team is joining Cloudflare. The companies plan to combine work on celld, Deno’s self-hosting-oriented project, and workerd, Cloudflare’s runtime for Workers. Ryan Dahl and Bert Belder will lead the effort to make self-hosting workerd a first-class supported use case.
Deno says future development will focus on the shared platform rather than a separate Deno runtime and hosting service. Cloudflare says it expects to share more about the work in the coming months, but its announcement does not give a release date or detailed compatibility guarantees. The public posts do not specify a transaction structure or financial terms, so describing the announcement as a disclosed acquisition with a known price would go beyond what they say.
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →In its announcement, Deno founder Ryan Dahl wrote, “We’ve decided to put our future development work into this shared platform rather than continuing to develop a separate runtime and hosting service.” (Deno’s October 9, 2026 announcement)
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How are celld, workerd, and Workers related?
Workers is the platform; workerd is its runtime
Cloudflare Workers is Cloudflare’s application platform. Workerd is the open-source runtime used by Workers. The Deno and Cloudflare announcements describe the intended collaboration as bringing celld code and ideas into workerd and improving its support for self-hosting.
Celld builds on the Workers programming model
Celld is Deno’s project for running applications in a self-managed environment. Deno describes it as building on the Workers programming model, while Cloudflare says it had wanted an implementation of Workers and Durable Objects designed for self-hosting. That is the technical connection behind the teams’ plan—not an announcement of a dispute over copied code or a claim of wrongdoing.
Cloudflare Distinguished Engineer Kenton Varda and Ryan Dahl described the aim as making “the same primitives” usable in more places. Varda also characterized celld as “an implementation of Workers and Durable Objects designed to be fully compatible with our own, while being focused on being self-hostable and scalable.” Both statements are from Cloudflare’s October 9, 2026 post.
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What happens to Deno’s runtime, Deno Deploy, and JSR?
Deno’s October 9 announcement sets out these commitments and plans. The time periods are relative to the announcement; it does not give exact calendar dates for the milestones.
| Project or service | Announced plan |
|---|---|
| Deno runtime | Deno says it will provide monthly bug-fix and security releases for another year, then end its own runtime development. The runtime will remain open source, and Deno welcomes community continuation. |
| Deno Deploy | Deno says the service will continue operating for six months before shutting down. It says it will support paying customers moving to Cloudflare Workers. |
| JSR | JSR will continue operating, with its infrastructure moving to Cloudflare. |
| rusty_v8 | Deno says it will continue supporting rusty_v8 and work toward integrating it into workerd. |
These are announced plans, not exact end dates or guarantees about the detailed scope of future compatibility. Deno’s post does not name calendar shutdown dates for Deno Deploy or the runtime-development transition.
Why are the teams pursuing self-hosting?
Dahl says operating Deno Deploy exposed how much infrastructure can sit behind a simple developer experience: multiple public clouds, databases, and interconnected services. Deno designed celld around self-hosting and a simpler operating model. Cloudflare, in turn, says it had wanted a self-hostable implementation of Workers and Durable Objects but had not found time to build one.
The stated goal is to make the Workers programming model available in more environments, rather than requiring every user to run applications only on Cloudflare’s network. The announcements do not yet establish when that support will ship, how it will work in detail, or which compatibility guarantees will apply.
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What should developers consider now?
- If you run Deno applications: Deno has announced monthly bug-fix and security releases for one more year, followed by the end of its own runtime development. Teams planning beyond that period should account for the possibility that ongoing runtime work will come from the community or the shared effort, rather than a separately developed Deno runtime.
- If you use Deno Deploy: The service is planned to operate for six months before shutdown. Paying customers are promised support moving to Workers; the announcement does not provide a migration schedule or describe the process in detail.
- If you need self-hosted Workers: The collaboration is aimed directly at making this easier, but no shipping date or detailed support matrix has been announced. Do not treat the planned work as an already available, fully specified deployment option.
- If you rely on JSR or rusty_v8: Deno says JSR will continue with infrastructure moving to Cloudflare, and that it will continue supporting rusty_v8 while working toward its integration into workerd.
For the full company statements, see Deno’s announcement and Cloudflare’s announcement, both published October 9, 2026.
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