React Native Version Mismatch Fix: JavaScript and Native Version Don't Match
Fix the React Native version mismatch error where JavaScript version does not match native version. Step-by-step solutions for Expo, bare React Native, simulator caching, git branch switching, CI/CD pipelines, and monorepo hoisting issues. Updated for 2026.
On this page
While building a React Native or Expo app, you may suddenly see a red screen with the error `React Native version mismatch. JavaScript version does not match native version`. This error appears after upgrading React Native, switching git branches, running on a device with a cached build, updating Expo SDK without rebuilding, or when your CI/CD pipeline serves stale native binaries. The JavaScript bundle and the compiled native code are on different React Native versions, so the bridge refuses to start.
The Error
What Causes This Error
React Native has two halves: the native binary (compiled Objective-C, Java, or Kotlin code) and the JavaScript bundle (your app code plus React Native JS runtime). Both halves need to be on the same React Native version to communicate through the bridge or the new JSI layer. A version mismatch happens when one half gets updated but the other does not. The native side and the JS side are literally speaking different versions of the protocol, so React Native refuses to start.
- Ran npm install react-native@latest but did not rebuild the native project
- Old native build cached on your simulator or device from a previous version
- Podfile.lock or android/build.gradle still references old native dependencies
- Metro bundler serving a cached JS bundle from a different branch
- Expo SDK upgrade changed the RN version but expo prebuild was not re-run
- CI/CD pipeline caching stale native builds across version changes
- Monorepo hoisting installed a different RN version in root node_modules
- Switching git branches that use different React Native versions
Fix 1: Clean Everything and Rebuild
This is the nuclear option that resolves most cases. Delete node_modules, iOS pods, Android build folders, and all caches, then reinstall everything from scratch. This works 90 percent of the time because it forces both the native binary and the JS bundle to rebuild from the same React Native version.
Expo Clean Rebuild
For Expo projects using prebuild or development builds, delete the generated native folders entirely and regenerate them. This ensures the native code matches your current Expo SDK and React Native version.
Expo Go Fix
If you are using Expo Go (managed workflow), the version mismatch usually means your Expo Go app version does not match your project sdkVersion in app.json. Update the Expo Go app on your phone or simulator to match.
Fix 2: Version Mismatch After Upgrading React Native
This is the most common scenario. You upgraded React Native or Expo SDK but native dependencies are still on the old version. First check what versions you actually have installed across JS and native.
If these versions do not match, that is your problem. For React Native 0.76 and above, use the official upgrade helper at react-native-community.github.io/upgrade-helper to see every file change required between your current and target version. Apply all changes in ios and android folders, then run the full clean rebuild from Fix 1.
Expo SDK Upgrade Fix
Fix 3: Version Mismatch on a Specific Device or Simulator
Sometimes the error only appears on one device while others work fine. This means that specific device has a stale native build cached from a previous React Native version. You need to remove the old app and install a fresh build.
Fix 4: Version Mismatch When Switching Git Branches
This happens when you switch between branches that use different React Native versions. Branch A uses RN 0.74, Branch B uses RN 0.76, you switch to Branch B but the native build from Branch A is still cached on the simulator.
To automate this, add a post-checkout git hook that cleans and reinstalls every time you switch branches.
Fix 5: Version Mismatch in CI/CD Pipeline
If this error shows up only in CI (GitHub Actions, Bitrise, CircleCI), it is almost always a caching issue. Your CI caches node_modules, Pods, or Gradle builds from a previous run that used a different React Native version. Use cache keys that include your lockfile hashes so the cache invalidates when dependencies change.
Fix 6: Monorepo and Workspaces Version Mismatch
In monorepos using Yarn workspaces, Turborepo, or Nx, version mismatches happen when the root node_modules has one version of React Native and your app workspace has another due to hoisting. First check for duplicate installations.
If you see multiple versions, force a single version using resolutions (Yarn) or overrides (npm) in your root package.json.
Fix 7: Metro Bundler Serving the Wrong Bundle
Sometimes the native app is fine but Metro is serving a JavaScript bundle built against a different version. This happens if Metro is running in the background from a different project or branch.
Quick Diagnosis Checklist
- Check JS version: cat node_modules/react-native/package.json | grep version
- Check iOS native version: cat ios/Podfile.lock | grep React-Core
- Check Android version: cat android/app/build.gradle | grep reactNativeVersion
- Check Expo SDK: cat app.json | grep sdkVersion
- Check for duplicate installations: find . -path */react-native/package.json -maxdepth 5
- Check Metro port: lsof -i :8081 should show only one process
- If versions do not match, clean everything and rebuild
- Pin react-native version exactly in package.json without caret or tilde
- Commit lockfiles (package-lock.json, yarn.lock, Podfile.lock) to git
- After every upgrade, delete Pods, Podfile.lock, and android/.gradle before rebuilding
Preventing Future Version Mismatches
Pin your React Native version exactly in package.json using 0.76.6 instead of ^0.76.6 or ~0.76.6. Semver ranges cause mismatches when dependencies resolve differently across environments. Commit all lockfiles to git so every developer and CI environment uses the exact same versions. Add a clean script to your package.json for quick rebuilds.
For Expo projects, always run npx expo install --fix after any upgrade to automatically align all package versions with your SDK.
Final Working Commands
Official-Style Error Explanation
The React Native version mismatch error occurs when the compiled native binary on your device or simulator was built with a different React Native version than the JavaScript bundle Metro is serving. React Native requires both halves to be on the same version to communicate through the bridge or JSI layer. The most common causes are upgrading React Native without rebuilding native code, stale cached builds on simulators or devices, switching git branches with different RN versions, CI/CD pipelines caching old native builds, and monorepo hoisting installing duplicate React Native versions. Start by cleaning all generated files and rebuilding from scratch, then verify that the JS version, iOS pod version, and Android Gradle version all match.
FAQ
What does React Native version mismatch actually mean?
It means the compiled native code (iOS or Android binary) on your device was built with a different React Native version than the JavaScript bundle Metro is serving. The two halves cannot communicate across version boundaries, so React Native shows this error instead of crashing silently.
Will reset-cache alone fix the version mismatch?
Usually not. The reset-cache flag only clears Metro JavaScript bundle cache. If the mismatch is in the native binary, which it usually is, you need to rebuild the native project too. That means pod install on iOS and gradlew clean on Android.
I see this error after running expo start. What do I do?
If you are using Expo Go, make sure your Expo Go app version matches your project sdkVersion in app.json. Update Expo Go on your phone. If you are using a development build with expo-dev-client, you need to rebuild the native binary with npx expo run:ios or npx expo run:android.
Does this error happen with the New Architecture?
Yes and it is actually more likely with the New Architecture because there are additional native codegen steps. After upgrading, make sure to run pod install with repo-update on iOS and clean all Android build artifacts. The codegen output must match the JS version exactly.
Can I downgrade React Native if the upgrade caused this?
Yes but you need to fully revert. Change the version in package.json, delete node_modules, ios/Pods, ios/Podfile.lock, and android/.gradle, then reinstall and rebuild everything. Partially reverting just package.json without cleaning native builds will cause the same mismatch error.
How do I fix this in a monorepo?
Use resolutions (Yarn) or overrides (npm) in your root package.json to force a single React Native version across all workspaces. Then check for duplicate installations with find . -path */react-native/package.json. You should only see one installation.
Shahmeer Rizwan
Full-Stack Developer