# New version of the Modeling app (4.0.0) and Chap (1.2.0)

**URL:** <https://community.dhis2.org/t/new-version-of-the-modeling-app-4-0-0-and-chap-1-2-0/70842>\
**Category:** Chap & Modeling\
**Tags:** climate, chap\
**Created:** [5 March 2026 10:53 UTC](https://community.dhis2.org/t/new-version-of-the-modeling-app-4-0-0-and-chap-1-2-0/70842 "2026-03-05T10:53:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jen.jones.arnesen](https://dhis2.b-cdn.net/user_avatar/community.dhis2.org/jen.jones.arnesen/32/31702_2.png) [@jen.jones.arnesen](https://community.dhis2.org/u/jen.jones.arnesen)\
**Post date:** [5 March 2026 10:53 UTC](https://community.dhis2.org/t/new-version-of-the-modeling-app-4-0-0-and-chap-1-2-0/70842/1 "2026-03-05T10:53:46Z")

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We are pleased to release a new version of **Chap** (v1.2.0) and the **Modeling app** (v4.0.0). This update includes numerous bug fixes, performance improvements, and new functionality developed over the past three months.

Note that Chap and the Modeling app are both still in beta. They are both under active development and the included models may give bad predictions.

### Highlights

- New Chap CLI commands `validate` and `eval` (`evaluate` is now deprecated)
- Modeling app fixes and improvements including
  - Dataset download
  - Correct sorting for split periods and org units in evaluation details screen
  - Experimental settings with feature toggles

A complete list of changes is available on the release pages on GitHub:

- [Chap Core releases](https://github.com/dhis2-chap/chap-core/releases)
- [Modeling app releases](https://github.com/dhis2-chap/chap-frontend/releases)

### Compatibility notes

In order to use Modeling app v4.0.0, you must have minimum Chap v1.1.5.

To upgrade:

- The Modeling app can be updated directly through DHIS2 using the app hub
- For Chap, please read and follow the [upgrade guide](https://chap.dhis2.org/chap-modeling-platform/modeling-app/upgrading-installation/).

### For questions and to report issues

If there are any issues while updating, please post on the CoP ( [Chap & Modeling - DHIS2 Community](https://community.dhis2.org/c/development/chap/84) ) or email us at [[chap@dhis2.org](mailto:chap@dhis2.org)](mailto:[chap@dhis2.org](mailto:chap@dhis2.org)).