React Native Roadmap 2026-W09: Expo SDK 55 Upgrade & EAS Update

What to ship in a React Native app this week: Expo SDK 55 upgrade with New Architecture, EAS Update bundle diffing, OTA update best practices, State of React Native 2025 stack audit, OpenAPI type generation with Hey API. Each one links to its source, then the 5-day plan below breaks it into steps you can apply to your codebase.

Week of February 23–March 1, 2026

Items This Week

---

5-Day Action Plan

---

🟧 Chunk 1 — Upgrade to Expo SDK 55 with New Architecture

Goal: Migrate the project to Expo SDK 55 (React Native 0.83, React 19.2) and drop the legacy architecture — ensuring the app runs on the latest, fully-supported stack and benefits from all New Architecture performance improvements.

Scope:

• Run npx expo install expo@55 and follow the official upgrade guide
• Migrate any legacy architecture-only dependencies to New Architecture equivalents
• Opt into Hermes v1 via app.json config flag
• Update metro.config.js, babel.config.js, and any deprecated APIs flagged during upgrade
• Run the full test suite and smoke-test on iOS and Android simulators
• Update CHANGELOG.md with breaking changes and resolved deprecations

Out of scope: Expo Router v55 navigation changes (separate chunk), EAS Update bundle diffing (Chunk 2).

Dependencies: None — isolated upgrade branch, no production impact until merged.

Acceptance criteria:

• App builds and runs on both iOS and Android with zero legacy architecture warnings
• React Native version reads 0.83.x in the app's package.json
• CHANGELOG.md documents every breaking change encountered
• A non-technical stakeholder can navigate the full app flow without errors

Estimated effort: M

---

🟧 Chunk 2 — Enable EAS Update Bundle Diffing for Smaller OTA Payloads

Goal: Reduce OTA update download sizes by up to 75% by activating bundle diffing in EAS Update — directly improving update adoption rates for users on slower networks.

Scope:

• Upgrade expo-updates to the SDK 55 version
• Enable bundle diffing in eas.json update configuration
• Push a test OTA update to the preview channel and measure the diff size vs. the full bundle
• Document the before/after payload size in a EAS-UPDATE.md file
• Verify that devices on the preview channel receive the patch correctly

Out of scope: Gradual rollout rules, rollback automation (addressed in Chunk 3), production channel rollout.

Dependencies: Expo SDK 55 must be installed (Chunk 1).

Acceptance criteria:

• A test OTA update is received by a device as a diff patch, not a full bundle
• Download size is measurably smaller than the equivalent full bundle (log the delta)
• EAS-UPDATE.md records baseline vs. diffed payload sizes
• No crashes or visual regressions on the updated device

Estimated effort: S

---

🟧 Chunk 3 — Implement OTA Update Best Practices (Channels, Rollback & Fingerprint)

Goal: Harden the OTA update strategy by applying the 5 best practices published by Expo — giving the team a safe, predictable release process and the ability to instantly roll back a bad update.

Scope:

• Configure preview, staging, and production update channels in eas.json
• Integrate fingerprint-based update detection using expo-updates API to prevent mismatched updates
• Implement a gradual rollout (10% → 50% → 100%) for the production channel
• Add a one-command rollback script to package.json (npm run update:rollback)
• Document the full update workflow in docs/ota-strategy.md

Out of scope: CI/CD automation of rollouts (future work), A/B testing of update content.

Dependencies: Expo SDK 55 and EAS Update bundle diffing (Chunks 1 & 2).

Acceptance criteria:

• Three update channels exist and are named correctly in the EAS dashboard
• A fingerprint mismatch is gracefully handled (no crash, user prompted to update)
• Gradual rollout is verified by deploying to 10% of the preview channel
• npm run update:rollback successfully points the production channel back to the previous bundle
• docs/ota-strategy.md is readable by a non-technical stakeholder

Estimated effort: M

---

🟦 Chunk 4 — Audit Project Stack Against State of React Native 2025 Results

Goal: Benchmark the project's current tooling, libraries, and architecture choices against the community consensus from the State of React Native 2025 survey — identifying gaps and quick wins to align with industry best practices.

Scope:

• Read through the State of React Native 2025 results focusing on: architecture adoption, navigation, state management, testing, and styling sections
• Map each major category to the project's current choice
• Identify 3 "high-retention / high-usage" libraries the project is not yet using
• Write a STACK-AUDIT.md with a two-column table: Current choice vs. Community favourite
• Open one follow-up issue per identified gap (labelled tech-debt)

Out of scope: Implementing the identified changes (tracked as separate issues).

Dependencies: None — purely analytical, no code changes required.

Acceptance criteria:

• STACK-AUDIT.md covers all 5 survey categories with current vs. recommended choices
• At least 3 follow-up tech-debt issues are created
• A non-technical stakeholder can read the audit summary in under 5 minutes
• The audit is reviewed and acknowledged by a second team member

Estimated effort: S

---

⚛️ Chunk 5 — Migrate API Types to OpenAPI-Driven Generation with Hey API + Zod

Goal: Eliminate hand-written API types and frontend/backend type drift by generating all API client types automatically from the OpenAPI specification — reducing bugs and saving hours of manual type maintenance per sprint.

Scope:

• Install @hey-api/openapi-ts and configure it to point to the project's OpenAPI spec
• Generate TypeScript types and a typed fetch client for all existing API endpoints
• Replace the top 3 hand-written type files with generated equivalents
• Add Zod schemas for runtime validation on the 3 most-used API response shapes
• Add a pnpm generate:api script to package.json and document it in README.md
• Set up MSW handlers using the generated types for existing unit tests

Out of scope: Migrating all API calls in one go (incremental migration), CI enforcement of schema freshness (future work).

Dependencies: An OpenAPI spec (.json or .yaml) must exist or be accessible from the backend team.

Acceptance criteria:

• pnpm generate:api runs without errors and produces updated type files
• The 3 replaced type files are deleted and replaced by imports from the generated client
• Zod validation catches a deliberately malformed API response in a unit test
• MSW handlers use generated types with no TypeScript errors
• README.md documents the generation workflow for new developers

Estimated effort: M

---