> For the complete documentation index, see [llms.txt](https://docs.idlayr.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.idlayr.com/changelog/readme/2026-06-29-android-sdk-2-4-0.md).

# Android SDK v2.4.0 (2026-06-29)

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**SDKs** · Android · 2026-06-29
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A Kotlin compatibility release. The SDK is now compiled on the Kotlin 1.9 line so the published AAR carries Kotlin 1.9 metadata (`mv=[1,9,0]`) and can be consumed by apps that are not yet on Kotlin 2.x.

## What changed

* The SDK is now compiled on **Kotlin 1.9.25** (previously 2.2.20 across the 2.3.x line).
* The published AAR is consumable by apps on **Kotlin 1.9.x or any 2.x**.
* **No public API changes** versus 2.3.6 — this release is functionally equivalent to the 2.3.x line.

## Which version should I use?

| Your app's Kotlin version | Recommended SDK            |
| ------------------------- | -------------------------- |
| Kotlin 1.9.x              | **2.4.0**                  |
| Kotlin 2.x                | 2.3.6 or 2.4.0 (both work) |

Teams already on 2.3.6 with a Kotlin 2.x consuming app do not need to upgrade. 2.4.0 is intended for teams that cannot move their app to Kotlin 2.2.x.

## Dependencies

* Kotlin: **1.9.25**
* Kotlin stdlib pinned via `resolutionStrategy` to prevent transitive bumps back to 2.x
* `androidx.core:core-ktx`: 1.13.1
* Test tooling aligned to the 1.9 line: `mockk` 1.13.13, `kotlinx-coroutines-test` 1.8.1, `kotlin-test` 1.9.25

Target and Compile SDK, Java version, and all other public-facing dependencies are unchanged from 2.3.6.

For more information on the Android SDK, see [Android SDK](https://docs.idlayr.com/get-started/sdks/android).


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