Why You Should Update Dependencies Regularly

3 min read
Best Practices
Maintenance

Technical debt compounds silently. One of its most insidious forms? Outdated dependencies.

I recently upgraded a project from Angular 20 to 21 and DevExtreme 24.2 to 25.2. It took focused effort, but it was manageable. Teams that skip multiple major versions often spend months catching up — Angular 8 to 16 migrations are notorious for this. The difference? Frequency of updates.

The Math of Delayed Updates

Consider two approaches:

Approach A: Update every 2 months, spend 1 day each time. Annual cost: 6 days.

Approach B: Update once a year, spend 2-4 weeks. Annual cost: 10-20 days.

The gap widens with each skipped cycle. Breaking changes stack. Deprecated APIs multiply. Documentation for migration paths disappears. Community support for old versions fades.

Why Teams Skip Updates

  • "It works, don't touch it"
  • No dedicated time in sprints
  • Fear of regressions
  • Lack of test coverage

Every reason is valid. Every reason becomes more expensive to address later.

A Practical Update Strategy

1. Automate the Obvious

Use Dependabot or Renovate. Configure them to auto-merge patch updates with passing CI. For minor versions, create PRs automatically but require manual review.

# .github/dependabot.yml
version: 2
updates:
  - package-ecosystem: 'npm'
    directory: '/'
    schedule:
      interval: 'weekly'
    groups:
      minor-and-patch:
        patterns:
          - '*'
        update-types:
          - 'minor'
          - 'patch'

2. Read Changelogs Before Updating

Five minutes reading the CHANGELOG saves hours debugging. Look for:

  • Breaking changes (usually marked with ⚠️ or BREAKING)
  • Deprecated APIs you're using
  • New features that simplify your code

3. Update in Isolation

Create a dedicated branch. Update one major dependency at a time. Run the full test suite. This makes rollbacks trivial and debugging focused.

git checkout -b chore/angular-21-upgrade
ng update @angular/core@21 @angular/cli@21
npm run test
npm run e2e

4. Make Updates a Habit

Don't wait for "the right moment" — it never comes. Block 2-4 hours monthly specifically for dependency updates. Treat it like any other technical task with a deadline.

5. Maintain Test Coverage

Updates without tests are gambling. You need:

  • Unit tests for business logic
  • Integration tests for critical paths
  • E2E tests for user flows

If coverage is low, improving it pays compound interest on every future update.

Framework-Specific Tips

Angular

Use ng update — it runs schematics that automatically migrate code:

ng update @angular/core @angular/cli

Check the Angular Update Guide before major upgrades. It lists every breaking change and migration steps.

DevExtreme and UI Libraries

These break more often than you'd expect. Pin exact versions in package.json during development. Test visual regressions — automated screenshots help.

RxJS

Major versions introduce operator changes. Use rxjs-compat temporarily during migration if needed, but remove it promptly.

Signs You've Waited Too Long

  • Multiple major versions behind
  • Dependencies of dependencies are incompatible
  • Security vulnerabilities in your dependency tree
  • New team members can't find relevant documentation

The Hidden Benefits

Regular updates aren't just about avoiding pain. They bring:

  • Performance improvements — frameworks optimize constantly
  • Smaller bundles — tree-shaking improves, dead code gets removed
  • Better developer experience — new APIs are usually cleaner
  • Security patches — vulnerabilities get fixed upstream

After the Angular 20→21 upgrade, bundle size dropped 14%. That's free performance for users.

Conclusion

Updating dependencies is like exercise. Skipping one session is fine. Skipping six months creates a problem that's painful to reverse.

The best time to update was yesterday. The second best time is now — but in small, regular increments.

Start this week. Pick one outdated dependency. Update it. Repeat.