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Hydrogen 2026-10 is now available

The new Hydrogen is now GA: A framework-agnostic JavaScript library to add Shopify commerce to your existing stack, plus skills for coding agents and starters for React Router and Next.js.
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Changelog
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Surfaces & APIs

Versions

Change type

  1. October 2026

    Surface
    1. New owner_type field for metafield declarations in Checkout and Customer Account UI extensions, required in 2027-01
      Action requiredCheckout UI

  2. September 2026

    Surface
    1. Request a bundle size exception for existing UI extensions
      Admin Extensions
    2. Customer Address APIs now support countryCode
      DeprecatedCheckout UI

  3. May 2026

    Surface
    1. Polaris web components migration guides now available for Checkout and Customer Account UI extensions
      Checkout UI
    2. Ship and pickup in one order now available in feature preview
      Action requiredAdmin Extensions

  4. April 2026

    Surface
    1. Deprecation of checkout metafields in checkout and customer account UI extensions
      Action requiredCheckout UI
    2. Automated testing for Shopify UI extensions with @shopify/ui-extensions-tester
      Admin Extensions
    3. Removing outdated Polaris reference docs
      Admin Extensions

  5. January 2026

    Surface
    1. Checkout UI extensions now default to non-blocking behavior
      Platform

  6. September 2025

    Surface
    1. Your app may be affected by remote products
      Breaking changesTools

  7. August 2025

    Surface
    1. Build an Announcement Bar Extension for the Thank You page or Customer Account Pages
      Checkout UI
    2. New: Support for nested cart lines
      Functions