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