Upgrading From a Previous Version

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

  • 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 Localization
    • Upgrade Migrations
    • Upgrade Pagination
    • Upgrade HTTP Responses
    • Upgrade Routing
    • Upgrade Security
    • Upgrade Sessions
    • Upgrade Validations
    • Upgrade View Parser

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https://codeigniter.com/user_guide/installation/upgrading.html