Deno's team joins Cloudflare as Deno Deploy gets a six-month countdown

Deno's whole team is joining Cloudflare, and Deno says it will stop building its own runtime and hosting service to work on a shared platform instead. Founder Ryan Dahl announced the move on October 9, 2026. This account rests on the two companies' own posts and Cloudflare's documentation, and deal terms were not disclosed in them.

Deno says what happens to its products is as follows. Deno Deploy, its hosting service, will keep running for six months and then shut down, with migration support for paying customers moving to Cloudflare Workers. The Deno runtime will get monthly bug-fix and security releases for another year, after which Deno will end its development. Deno says the runtime stays open source and welcomes others who want to carry it on. JSR, its package registry, will continue, with infrastructure moving to Cloudflare. Deno also says it will keep supporting rusty_v8 and work toward integrating it into workerd, Cloudflare's open-source Workers runtime.

The new part is the engineering plan. Last August Deno released celld, an open-source implementation of the Workers and Durable Objects model meant for self-hosting. Dahl and Cloudflare engineer Kenton Varda now say they will merge celld back into workerd, with Dahl and Deno's Bert Belder leading an effort to make self-hosting a first-class way to run the Workers model. Varda writes that workerd's Durable Objects support is single-instance only, good for local testing but unable to scale, and that Cloudflare never built the surrounding tooling to make self-hosting work. That is Cloudflare describing its own gap, and nothing yet shows the merged project exists. Cloudflare says more announcements will come in the coming months.

Durable Objects are the center of the plan. Cloudflare's documentation describes each one as a Worker that combines compute with storage, with a globally unique name and attached durable storage. Dahl says the pairing of inexpensive serverless execution, persistent state, WebSockets and a JavaScript interface suits AI agent harnesses. That is his view of the design, not a tested result.

Still unclear are the financial terms, the exact shutdown dates, how existing Deno users will fare after the year ends, and when a self-hostable merged runtime will be ready. For developers on Deno Deploy, the practical point is a deadline of roughly April 2027, counted from the announcement, since neither post names a calendar date. For everyone else, it is a bet that the Workers model can run well outside Cloudflare's network.

Revised 16 October 2026: Guth re-read the original sources and rewrote this article. The earlier version remains available as revision 1.