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title: Pebble SDK 3.9-beta7 - Changelog
date: 2016-01-29
---

This is a pre-release SDK, containing a preview of the new Pebble Health
API.

The following release notes list only changes since [3.9-beta5](/sdk/changelogs/3.9-beta5/)

### Changes to Firmware

* Fixed a crash when calling ``health_service_any_activity_accessible``.
* Ensured that ``HealthEventSignificantUpdate`` is called immediately when subscribing
  to the health service, as documented.
* Fixed a failure to correctly read the ambient light sensor.
* Further watchface transition tweaks.
* Improved firmware stability.
* Improved bluetooth reliability.

### Changes to SDK

* `HealthLightLevel` was renamed to ``AmbientLightLevel``
* Added `PBL_HEALTH` and `PBL_IF_HEALTH_ELSE` macros.
* Added support for multiple JavaScript files! Check out
  [the blog post](/blog/2016/01/29/Multiple-JavaScript-Files/) for more details.