Request a bundle size exception for existing UI extensions

Official Shopify changelog summary with source attribution, release tags, and community reactions.

Track this Shopify release note alongside related changelog updates, risky changes, and weekly digest signals from the developer community.

Shopify·Sep 17, 2026, 07:30 PMFeatureMay break your integrationAI-assisted summary

Summary

UI extensions using API version 2025-10+ are limited to 64 KB compressed bundles (128 KB for full‑page customer account) and must upgrade to API version 2026-01+ by Oct 1 2026.
If a bundle exceeds the limit, run `shopify app build` and submit the minified bundle with its esbuild metafile through the bundle size exception form for possible limit increase.
Exceptions are denied for avoidable weight such as heavy libraries, duplicate dependencies, or bundled translations; use native localization APIs instead.

breakingfeaturedocssource healthy

Official source Last checked Sep 20, 2026, 8:03 AM

Loading follow options…

official source

Verify the original release note

Every summary should remain traceable to the original changelog or release source.

AI-assisted summarysource healthyLast checked Sep 20, 2026, 8:03 AM

related channels

Turn this Shopify release note into a weekly digest for the tools you actually use.