# CodeIgniter User Guide Version 2.0.0

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# Upgrading From a Previous Version

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

- Upgrading from 1.7.2 to 2.0
- Upgrading from 1.7.1 to 1.7.2
- Upgrading from 1.7.0 to 1.7.1
- Upgrading from 1.6.3 to 1.7.0
- Upgrading from 1.6.2 to 1.6.3
- Upgrading from 1.6.1 to 1.6.2
- Upgrading from 1.6.0 to 1.6.1
- Upgrading from 1.5.4 to 1.6.0
- Upgrading from 1.5.3 to 1.5.4
- Upgrading from 1.5.2 to 1.5.3
- Upgrading from 1.5.0 or 1.5.1 to 1.5.2
- Upgrading from 1.4.1 to 1.5.0
- Upgrading from 1.4.0 to 1.4.1
- Upgrading from 1.3.3 to 1.4.0
- Upgrading from 1.3.2 to 1.3.3
- Upgrading from 1.3.1 to 1.3.2
- Upgrading from 1.3 to 1.3.1
- Upgrading from 1.2 to 1.3
- Upgrading from 1.1 to 1.2
- Upgrading from Beta 1.0 to Beta 1.1