Hono 4.12.33

Hono 4.12.33 — Released July 31, 2026. This patch release ships three targeted fixes across the cookie, JSX, and server-adapter layers, and trims a runtime dependency from the core package.

Overview

Hono 4.12.33 is a low-risk maintenance release. There are no new features, no breaking changes, and no deprecations. The focus is on correctness fixes reported by the community since 4.12.32.

Fixes

• Cookie parsing relaxed — Name validation when parsing the Cookie header has been relaxed, resolving rejections of valid cookie names that stricter validation had incorrectly flagged (PR #5164).
• JSX useSyncExternalStore handling — The JSX runtime now correctly handles subscription and snapshot changes in useSyncExternalStore, fixing a class of stale-render issues in server-side JSX rendering (PR #5166).

Dependency Changes

• @hono/node-server bumped — The Node.js server adapter dependency has been updated to its latest version (PR #5167).
• undici removed — The core package now relies on the global fetch instead of the bundled undici implementation, reducing dependency surface (PR #5168).

Attribution

Changes were contributed by the Hono maintainers and community. The full changelog, including the complete diff from 4.12.32, is available in the GitHub repository.

Upgrade Notes

Update via npm install hono@latest, bun update hono, or pnpm add hono@latest. Projects already on the 4.12.x series can upgrade directly with no configuration changes expected.