Expo SDK 56 & The AI Security Frontier Welcome to Issue #21! This week is anchored by a massive release for the mobile ecosystem and a sobering look at the future of security.
First, Expo SDK 56 has officially landed. The headline feature is that Expo UI (bringing native Jetpack Compose and SwiftUI primitives to React Native) is now production-ready. With the jump to React Native 0.85 and a much faster Node.js-based watcher replacing Watchman, this is an update you'll want to prioritize.
On the security side, Cloudflare published a fascinating breakdown of "Project Glasswing." They turned Anthropic's new Mythos model loose on their internal codebase, and it uncovered thousands of critical vulnerabilities. It's a stark reminder that AI is fundamentally shifting the balance of offensive and defensive security.
We also have a deep technical piece from Peter Piekarczyk on managing render cycles in Jotai, and a great guide from Callstack on handling OTA updates within complex brownfield apps.
Let's dive in.  | | Project Glasswing: what Mythos showed us In recent weeks, we pointed Mythos and other security-focused LLMs at live code across critical parts of our infrastructure. We share what we observed, the models’ strengths and weaknesses, and what the work around them needs to look like before any of it can scale. |
|
Structural sharing, selectAtom, and why your jotai atoms re-render too much | Peter Piekarczyk When Object.is isn't enough, when selectAtom is a trap, and how to recreate React Query's structural sharing in plain jotai so plain derived atoms keep working. |
|
 | | Expo Updates in Isolated Brownfield with SDK 55 Learn how to enable Expo Updates in an Isolated Brownfield setup with Expo SDK 55, including iOS packaging, Android patching, and OTA testing. |
|
 | | ASO Skills: ASO in Your AI Workflow Expo made shipping fast, but discovery is the new bottleneck. ASO Skills puts App Store Optimization inside Cursor, Claude Code, and Codex. |
|
 | | Best way to build a mobile app that makes money in 2026 An opinionated take on the best Expo stack, what data tells about app monetization, and why you should still choose React Native to win |
|
 | | Expo SDK 56 Check out new updates and improvements to Expo and EAS from the Expo team. |
|
|
Whether you're migrating to SDK 56 or rethinking your state management strategy, the underlying theme this week is efficiency—letting the tools handle the heavy lifting so you can focus on shipping.
Have a great week, and I'll see you for Issue #22! |