Python 3.9 was EOL as of October 31st, 2025.

…lity (#391)

…402)

…fig (#403)

🤖 I have created a release *beep* *boop*
---


##
[9.15.0](9.14.1...9.15.0)
(2026-02-10)


### Features

* Drop support for python 3.9
([#393](#393))
([5b761bd](5b761bd))
* Update ChangeSet to always require a Selector
([#405](#405))
([5dc4f81](5dc4f81))


### Bug Fixes

* Add context manager for clearer, safer locks
([#396](#396))
([beca0fa](beca0fa))
* Address potential race condition in FeatureStore update_availability
([#391](#391))
([31cf487](31cf487))
* Allow modifying fdv2 data source options independent of main config
([#403](#403))
([d78079e](d78079e))
* Mark copy_with_new_sdk_key method as deprecated
([#353](#353))
([e471ccc](e471ccc))
* Prevent immediate polling on recoverable error
([#399](#399))
([da565a2](da565a2))
* Redis store is considered initialized when `$inited` key is written
([e99a27d](e99a27d))
* Stop FeatureStoreClientWrapper poller on close
([#397](#397))
([468afdf](468afdf))
* Update DataSystemConfig to accept list of synchronizers
([#404](#404))
([c73ad14](c73ad14))
* Update reason documentation with inExperiment value
([#401](#401))
([cbfc3dd](cbfc3dd))
* Update Redis to write missing `$inited` key
([e99a27d](e99a27d))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Release-only changes (version strings and documentation) with no
functional code modifications in this diff.
> 
> **Overview**
> Bumps the SDK release from `9.14.1` to `9.15.0` across version sources
(`pyproject.toml`, `ldclient/version.py`, release-please manifest) and
updates `PROVENANCE.md` to reference the new version.
> 
> Updates `CHANGELOG.md` with the `9.15.0` release notes, including FDv2
EAP breaking API adjustments (e.g., `ChangeSetBuilder.finish()` now
requires a `Selector`, and `DataSystemConfig.synchronizers` supports
multiple synchronizers), Python 3.9 support drop, and a set of bug-fix
entries.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
71a9224. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: jsonbailey <jbailey@launchdarkly.com>