Upgrading your Angular project from version 19 to 20 ensures you get the newest performance improvements, updated APIs, better tooling, and long-term support. This guide explains each step clearly so you can upgrade without breaking your existing application.
1. Why Upgrade to Angular 20?
Angular 20 introduces enhancements across performance, developer experience, and new APIs. Major improvements include:
- Faster builds through compiler optimizations
- Stable improvements to Signals & Zone-less architecture
- Smarter hydration for SSR-based apps
- Updated Angular Material components
- Better TypeScript support
- Reduced bundle sizes
Before upgrading, ensure your existing Angular 19 project is fully updated with the latest patches.
2. Pre-Upgrade Requirements
Before starting, ensure the following:
✔ Update Node.js
Angular 20 may require a newer Node version.
Check your version:
node -v
✔ Backup Your Project
Commit to Git or take a full backup.
✔ Update Angular CLI Globally
npm install -g @angular/cli@latest
3. Upgrade Angular 19 → 20 (Official Method)
Use Angular’s update command which automatically applies migrations and updates all internal packages:
ng update @angular/core@20 @angular/cli@20
If your project uses Angular Material:
ng update @angular/material@20
This command handles:
- Package.json updates
- Auto-migrations
- Removal of deprecated APIs
- TypeScript and RxJS adjustments
4. Additional Package Updates
✔ Update TypeScript (If required)
Angular 20 may require the latest TypeScript version:
npm install typescript@latest --save-dev
✔ Update RxJS
If the CLI recommends updating RxJS:
ng update rxjs
✔ Update Third-Party Libraries
Make sure your UI libraries (PrimeNG, NG-Zorro, etc.) support Angular 20.
5. Possible Breaking Changes in Angular 20
While most migrations are automatic, check for:
- Removed deprecated lifecycle hooks
- Updated Signals behavior
- Stricter template type checking
- Material component updates
- Routing improvements that may require refactoring
- Hydration/SSR changes
Review Angular CLI logs to identify required fixes.
6. Test Everything After Upgrading
Run your Development Server:
ng serve
Execute Unit Tests:
ng test
Perform a Production Build:
ng build --configuration production
Fix any warnings or errors before deploying.
7. Recommended Post-Upgrade Steps
🔹 Reinstall Node Modules
If you see dependency conflicts:
rm -rf node_modules
npm install
🔹 Clear Angular Cache
ng cache clean
🔹 Manually Review Deprecated Code
Search for warning messages in console and update code accordingly.
8. Final Deployment Checklist
Before deploying to production:
- Ensure SSR or hydration works correctly
- Validate forms and routing
- Rebuild and test on staging
- Commit and document the upgrade
Your project is now fully migrated from Angular 19 → Angular 20.
Citations
Internal: https://savanka.com/category/savanka-helps/
External: http://angular.dev/