Deno joins Cloudflare — Deno Deploy will shut down and runtime development will end

On October 9, 2026 Ryan Dahl announced that the entire Deno team is joining Cloudflare. Instead of continuing to develop its separate JavaScript runtime and Deno Deploy hosting service, the team will focus on combining celld with Cloudflare's open-source workerd runtime to support distributed, self-hostable Workers and Durable Objects. Deno says Deploy will keep running for six months and then shut down, with migration help for paying customers moving to Cloudflare Workers. The Deno runtime will receive monthly bug-fix and security releases for one year; after that, the team will stop its development. The runtime remains open source and community continuation is possible. JSR will remain operational as its infrastructure moves to Cloudflare, and rusty_v8 support continues.

Builders have two different decisions. Deno Deploy users need a hosting migration plan before a hard service shutdown; runtime users need to reassess maintenance and security exposure once official development ends. The new Cloudflare effort could eventually let teams operate Workers and Durable Objects on their own machines rather than relying on one network, but that portability is a development objective, not a delivered compatibility guarantee. Deno's runtime is not being immediately removed or relicensed.

Deno's October 9 statement says the hosting service will continue for six months before shutdown. Paying customers are offered help migrating to Cloudflare Workers. Teams should inventory deployments, stateful services, secrets, domain routing, logs, storage and any runtime-specific APIs before choosing a replacement; compatibility is not promised to be automatic.

The standalone Deno runtime gets one year of monthly security and bug-fix releases. After that, the joining team will stop developing it, while the code remains open source. Existing Deno CLI and compiled-binary users therefore face a maintenance-owner question rather than an immediate breaking release.

Cloudflare's workerd runtime is already open source, but its current self-hosted Durable Objects implementation cannot scale beyond a single instance in the way Cloudflare's hosted platform can. The teams intend to merge celld's distributed routing and storage design with workerd so self-hosters can run the Workers model across multiple servers. No production-ready merged distribution or migration date was promised.

The JSR registry continues operating, with its infrastructure moving to Cloudflare. The team also plans to maintain rusty_v8 and work toward integrating it with workerd. Neither commitment means Deno Deploy or the standalone Deno runtime will keep receiving the same long-term development investment.