Deno team joins Cloudflare: Deno runtime gets one more year of fixes, Deno Deploy shuts down in six months, celld folds into workerd for self-hosted agent infra

On Oct 9, 2026 Ryan Dahl announced that the entire Deno team is joining Cloudflare, with a companion post by Kenton Varda on the Cloudflare blog. Concretely: the Deno runtime gets one more year of monthly bugfix and security releases, after which Deno Land ends development (the code stays open source); Deno Deploy keeps running for six months, then shuts down, with migration support to Cloudflare Workers for paying customers; JSR continues on Cloudflare infrastructure; rusty_v8 stays supported and will be integrated into workerd.

The technical center of the deal is celld, a Rust single binary that self-hosts the Workers + Durable Objects programming model: each cell is a single-threaded object with its own SQLite database, replicated as Litestream LTX files into a bucket you own, with ownership assigned by conditional bucket writes rather than a consensus service. Cloudflare concedes that open-source workerd only supports single-instance Durable Objects; Dahl and Bert Belder will now merge celld's ideas into workerd to make self-hosting first-class. Dahl explicitly frames Durable Objects (cheap serverless execution, persistent state, WebSockets) as the substrate for agent harnesses.

Vendor-reported celld figures: 0.47 MB per resident cell, 2,500 cells per 8 GB node, 0.2/0.3 ms p50/p99 stateless latency, ~4 ms hibernated-cell wake, ~20 s failover with zero lost acknowledged writes. Its cost chart (official assumptions, excluding traffic and bucket ops) puts 10,000 resident cells at ~$195/month vs ~$41,500 on managed Durable Objects. Deno Deploy users should plan a migration within six months; celld is still beta.