How to Upgrade to Drupal 12 – Complete Migration Guide

How to Upgrade to Drupal 12: A Complete Step-by-Step Migration Guide

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• SEO Title: How to Upgrade to Drupal 12: Complete Step-by-Step Migration Guide (2026)
• URL Slug: /how-to-upgrade-to-drupal-12
• Meta Title: How to Upgrade to Drupal 12 – Complete Migration Guide
• Meta Description: Learn how to upgrade to Drupal 12 safely with this complete step-by-step migration guide covering Composer, deprecated code, modules, themes, testing, and deployment.
• Focus Keyword: How to Upgrade to Drupal 12

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HOW TO
UPGRADE
TO DRUPAL 12
STEP-BY-STEP
GUIDE

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Upgrade smoothly. Stay secure. Stay future-ready.

Why Upgrade?

Drupal 12 delivers improved performance, stronger security, cleaner APIs, better PHP compatibility, and a smoother developer experience.

Prerequisites

• SSH access
• Composer
• Git
• Full database backup
• File backup
• Staging environment
• Administrator access

Step 1 — Check System Requirements

Verify supported PHP, Composer, database, and web server versions before upgrading.

Step 2 — Create a Complete Backup

Back up:

• Database
• Drupal files
• Custom modules
• Themes
• Uploaded media
• Configuration

Step 3 — Update Drupal 11

Update Drupal core, contributed modules, themes, and Composer dependencies before beginning the major upgrade.

Step 4 — Audit Contributed Modules

Confirm every contributed module supports Drupal 12. Remove unused or abandoned modules.

Step 5 — Remove Deprecated Code

Use Upgrade Status, Drupal Rector, and PHPStan for Drupal to identify deprecated APIs and update custom code.

Step 6 — Update Composer Dependencies

Update Drupal core packages and resolve dependency conflicts.

Step 7 — Upgrade Drupal Core

Install Drupal 12, clear caches, and verify the site status.

Step 8 — Run Database Updates

Execute database updates and rebuild caches.

Step 9 — Test Everything

Validate:

• Frontend pages
• Forms
• Media
• Layout Builder
• User permissions
• Integrations
• Performance

Step 10 — Deploy to Production

1. Enable maintenance mode.
2. Take a final backup.
3. Deploy code.
4. Run database updates.
5. Clear caches.
6. Verify functionality.
7. Disable maintenance mode.
8. Monitor logs.

Common Upgrade Issues

Problem Solution

Composer conflicts Update package constraints Deprecated APIs Refactor custom code Unsupported modules Replace or remove Theme incompatibility Update Twig/templates PHP mismatch Upgrade hosting environment

Best Practices

• Upgrade on staging first.
• Use Git.
• Keep backups.
• Test thoroughly.
• Monitor logs after deployment.

FAQ

Is upgrading from Drupal 11 difficult?

No. If deprecated code has already been addressed, the upgrade is typically straightforward.

Do I need Composer?

Yes. Composer is the recommended way to manage Drupal dependencies.

Internal Links

• Drupal 12 Launch Guide
• Drupal Migration Services
• Drupal Development Services
• Drupal vs WordPress