Upgrading From a Previous Version

Please read the upgrade notes corresponding to the version you are upgrading from.

See also Backward Compatibility Notes.

The manual mentions changes to project space. To perform the update, you need to compare the original files from vendor/codeigniter4/framework or from the ZIP archive and make changes.

Example, the original app/Config/App.php will be located in vendor/codeigniter4/framework/app/Config/App.php. Alternatively, replace it with a new file and add your previous lines.

Note

If you don’t know what version of CodeIgniter you are currently running, you can get it from the Debug Toolbar, or simply echo the constant \CodeIgniter\CodeIgniter::CI_VERSION.

• Backward Compatibility Notes
• Upgrading from 4.7.0 to 4.7.1
• Upgrading from 4.6.x to 4.7.0
• Upgrading from 4.6.4 to 4.6.5
• Upgrading from 4.6.3 to 4.6.4
• Upgrading from 4.6.2 to 4.6.3
• Upgrading from 4.6.1 to 4.6.2
• Upgrading from 4.6.0 to 4.6.1
• Upgrading from 4.5.8 to 4.6.0
• Upgrading from 4.5.7 to 4.5.8
• Upgrading from 4.5.6 to 4.5.7
• Upgrading from 4.5.5 to 4.5.6
• Upgrading from 4.5.4 to 4.5.5
• Upgrading from 4.5.3 to 4.5.4
• Upgrading from 4.5.2 to 4.5.3
• Upgrading from 4.5.1 to 4.5.2
• Upgrading from 4.5.0 to 4.5.1
• Upgrading from 4.4.8 to 4.5.0
• Upgrading from 4.4.7 to 4.4.8
• Upgrading from 4.4.6 to 4.4.7
• Upgrading from 4.4.5 to 4.4.6
• Upgrading from 4.4.4 to 4.4.5
• Upgrading from 4.4.3 to 4.4.4
• Upgrading from 4.4.2 to 4.4.3
• Upgrading from 4.4.1 to 4.4.2
• Upgrading from 4.4.0 to 4.4.1
• Upgrading from 4.3.8 to 4.4.0
• Upgrading from 4.3.7 to 4.3.8
• Upgrading from 4.3.6 to 4.3.7
• Upgrading from 4.3.5 to 4.3.6
• Upgrading from 4.3.4 to 4.3.5
• Upgrading from 4.3.3 to 4.3.4
• Upgrading from 4.3.2 to 4.3.3
• Upgrading from 4.3.1 to 4.3.2
• Upgrading from 4.3.0 to 4.3.1
• Upgrading from 4.2.12 to 4.3.0
• Upgrading from 4.2.11 to 4.2.12
• Upgrading from 4.2.10 to 4.2.11
• Upgrading from 4.2.9 to 4.2.10
• Upgrading from 4.2.7 to 4.2.8
• Upgrading from 4.2.6 to 4.2.7
• Upgrading from 4.2.5 to 4.2.6
• Upgrading from 4.2.3 to 4.2.5
• Upgrading from 4.2.2 to 4.2.3
• Upgrading from 4.2.1 to 4.2.2
• Upgrading from 4.2.0 to 4.2.1
• Upgrading from 4.1.9 to 4.2.0
• Upgrading from 4.1.7 to 4.1.8
• Upgrading from 4.1.6 to 4.1.7
• Upgrading from 4.1.5 to 4.1.6
• Upgrading from 4.1.4 to 4.1.5
• Upgrading from 4.1.3 to 4.1.4
• Upgrading from 4.1.2 to 4.1.3
• Upgrading from 4.1.1 to 4.1.2
• Upgrading from 4.0.5 to 4.1.0 or 4.1.1
• Upgrading from 4.0.4 to 4.0.5
• Upgrading from 4.0.x to 4.0.4
• Upgrading from 3.x to 4.x
  • Upgrade Models
  • Upgrade Views
  • Upgrade Controllers
  • Upgrade Configuration
  • Upgrade Database
  • Upgrade Emails
  • Upgrade Encryption
  • Upgrade Working with Uploaded Files
  • Upgrade HTML Tables
  • Upgrade Image Manipulation Class
  • Upgrade Localization
  • Upgrade Migrations
  • Upgrade Output Class
  • Upgrade Pagination
  • Upgrade Routing
  • Upgrade Security
  • Upgrade Sessions
  • Upgrade Validations
  • Upgrade View Parser