--- title: "Koin 4.0 Release: Powered by Kotlin 2.0" description: Koin 4.0, powered by Kotlin 2.0.20, with major updates across Kotlin, Android, Compose, & Multiplatform APIs. Better dependency injection & performance. image: https://blog.kotzilla.io/hubfs/Screenshot%202024-10-24%20at%2012.06.14.png --- [Skip to content](https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0#main-content) [![kotzilla (3)](https://blog.kotzilla.io/hubfs/kotzilla%20(3).svg)](https://kotzilla.io/) - [Koin](https://insert-koin.io/) - [Koin IDE Plugin](https://plugins.jetbrains.com/plugin/26131-koin-dependency-injection-official-) - [Koin LTS](https://kotzilla.io/koin-lts) - [Developer Hub](https://doc.kotzilla.io/) Open main navigation Close main navigation - [Koin](https://insert-koin.io/) - [Koin IDE Plugin](https://plugins.jetbrains.com/plugin/26131-koin-dependency-injection-official-) - [Koin LTS](https://kotzilla.io/koin-lts) - [Developer Hub](https://doc.kotzilla.io/) - [Contact us](https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0#contact) [Contact us](https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0#contact) Oct 15, 2024, 10:32:18 AM # Koin 4.0 Release: Powered by Kotlin 2.0 [The Kotzilla Team](https://blog.kotzilla.io/author/the-kotzilla-team) Share: [facebook-f icon](http://www.facebook.com/share.php?u=https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0) [linkedin-in icon](http://www.linkedin.com/shareArticle?mini=true&url=https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0) [Twitter icon](https://twitter.com/intent/tweet?url=https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0) [pinterest-p icon](http://pinterest.com/pin/create/link/?url=https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0) [envelope icon](mailto:?body=https://blog.kotzilla.io/koin-4.0-powered-by-kotlin-2.0) Koin 4.0 Release: Powered by Kotlin 2.0 4:11 ![Koin 4.0 Powered by Kotlin 2.0](https://139572340.fs1.hubspotusercontent-eu1.net/hub/139572340/hubfs/Screenshot%202024-10-15%20at%2011.22.20.png?width=1200&length=1200&name=Screenshot%202024-10-15%20at%2011.22.20.png)   [Koin 4.0 is a major release](https://github.com/InsertKoinIO/koin/releases), now based on Kotlin 2.0.20. It brings significant improvements across Kotlin, Android, Compose, and Multiplatform APIs. This version also includes important deprecations and API clean-ups, all aimed at streamlining the framework and improving performance. *Here’s a detailed breakdown of what’s new and what you need to know:* ## **Kotlin 2.0.20: A New Baseline** Ensure your project is using at least **Kotlin 2.0.20**. Older versions may lead to crashes due to changes in the Kotlin Multiplatform (KMP) API. ## **Core & Kotlin Multiplatform API Enhancements** ### **Internal Optimizations**: - **Context Passing**: More dynamic handling of injected parameters, improving the resolution order based on definitions, parameters, and scope. - **Thread-Safe Collections**: Improved internal collections for better stability in concurrent environments. - **Kotlin Time API**:  Use the Kotlin standard Time API instead of old internals, simplifying internal architecture.   ### **Koin-Fu Project (Experimental)** The **Koin-Fu Project** is an experimental DSL project aimed at unifying the API and improving the user experience for better data handling and comprehension. The long-term goal is to support Koin-Fu through a Kotlin compiler plugin, moving away from the current reflection-based API. The project aims to refine the **lambda** and **singleOf** APIs and improve internal data for better configuration checks. ## **Android API Updates** ### **ViewModel API: Now Multiplatform** The ViewModel API has been centralized in the koin-core-viewmodel package, making it fully multiplatform. Deprecated methods in the old ViewModel DSL are being phased out. You can update your imports to `org.koin.core.module.dsl.*` to avoid warnings. ![Screenshot 2024-10-15 at 10.41.12](https://blog.kotzilla.io/hs-fs/hubfs/Screenshot%202024-10-15%20at%2010.41.12.png?width=600&height=401&name=Screenshot%202024-10-15%20at%2010.41.12.png)*koinViewModel with a Compose Multiplatform app* ### **AndroidX Startup: Optimized Loading** The new koin-androidx-startup package optimizes the startup process, reducing load times by up to 40%. The onKoinStartup delegate simplifies configuration in the Application’s initialization. ### **Activity & Fragment Scope Fixes** We've addressed scope propagation issues in Android Activity and Fragment lifecycle management. ## **Compose API Improvements** We've updated Koin’s **Compose API** for better Multiplatform support. The koin-androidx-compose and koin-compose-viewmodel APIs now share a unified codebase, improving integration across platforms. We've also added full lifecycle handling and stable **WebAssembly (Wasm)** integration. ### **Testing API Enhancements** ### **Parameter Injection** We've added support for injected parameters in the Verify() API, making it easier to test dynamic behavior. We've also improved parameter injection to better handle missing or incorrect definitions. ![Screenshot 2024-10-15 at 10.51.23](https://blog.kotzilla.io/hs-fs/hubfs/Screenshot%202024-10-15%20at%2010.51.23.png?width=600&height=176&name=Screenshot%202024-10-15%20at%2010.51.23.png) ### **Missing Definition or Parameter Generation** We've enabled the Verify() API to automatically generate fixes for missing definitions, streamlining the testing process. ![Screenshot 2024-10-15 at 10.53.03](https://blog.kotzilla.io/hs-fs/hubfs/Screenshot%202024-10-15%20at%2010.53.03.png?width=600&height=157&name=Screenshot%202024-10-15%20at%2010.53.03.png) *Code suggestion to resolve missing definitions or parameter injection issues.* ## Ktor API Updates We've updated Koin’s integration with **Ktor 2.x**, improving scope management and implementing UUID-based scope instance identification. We are also planning future integrations for **Ktor 3**. Watch this space  ## **Breaking Changes** Several deprecated APIs have been removed: - - CheckModules: Replaced by the **Verify()** API. - **ViewModel DSL**: Now centralized in **koin-core-viewmodel** which is based on the new Multiplatform API. - **Reflection-based APIs**: The KoinReflect API and related annotations have been removed. - **Android ViewModel API**: Deprecated methods such as stateViewModel and sharedStateViewModel have been removed. - **Compose API**: Old methods like get, inject, and stateViewModel have been deprecated in favor of newer integrations. ### **Renamings**: We've renamedApplicationAlreadyStartedException  to KoinApplicationAlreadyStartedException for improved clarity.   ### **Documentation and Resources** We've moved package information to the [Koin website](https://insert-koin.io/docs/setup/koin/), to reduce clutter in project README files. Updated guides cover Compose integration, isolated contexts, and advanced use cases. You can find more detailed documentation on the [updated Compose page ](https://insert-koin.io/docs/reference/koin-compose/compose/) [Koin](https://blog.kotzilla.io/tag/koin), [Android](https://blog.kotzilla.io/tag/android), [Kotlin](https://blog.kotzilla.io/tag/kotlin), [Dependency Injection](https://blog.kotzilla.io/tag/dependency-injection), [Kotlin Multiplatform](https://blog.kotzilla.io/tag/kotlin-multiplatform), [KMP](https://blog.kotzilla.io/tag/kmp), [Compose Multiplatform](https://blog.kotzilla.io/tag/compose-multiplatform) ## Related posts [![](https://blog.kotzilla.io/hs-fs/hubfs/Screenshot%202024-02-05%20at%2016.40.56.png?height=200&name=Screenshot%202024-02-05%20at%2016.40.56.png)](https://blog.kotzilla.io/koin-3.6.0-wasm-alpha2) [Koin](https://blog.kotzilla.io/tag/koin), [Android](https://blog.kotzilla.io/tag/android), [Kotlin Multiplatform](https://blog.kotzilla.io/tag/kotlin-multiplatform) ## [Introducing Koin 3.6.0-wasm-alpha2: Expanding Koin's Horizons to Kotlin/Wasm](https://blog.kotzilla.io/koin-3.6.0-wasm-alpha2) [Arnaud Giuliani](https://blog.kotzilla.io/author/arnaud-giuliani) Feb 5, 2024, 9:52:19 AM The Kotlin ecosystem is undergoing rapid evolution, and with the recent elevation of Kotlin for... [Read more](https://blog.kotzilla.io/koin-3.6.0-wasm-alpha2) [![](https://blog.kotzilla.io/hs-fs/hubfs/Screenshot%202023-11-23%20at%2015.48.08.png?height=200&name=Screenshot%202023-11-23%20at%2015.48.08.png)](https://blog.kotzilla.io/koin-ready-for-kotlin-2.0) [Koin](https://blog.kotzilla.io/tag/koin), [Kotlin](https://blog.kotzilla.io/tag/kotlin), [KMP](https://blog.kotzilla.io/tag/kmp) ## [Embracing the Future: Koin is Ready for Kotlin 2.0](https://blog.kotzilla.io/koin-ready-for-kotlin-2.0) [The Koin crew](https://blog.kotzilla.io/author/the-koin-crew) Nov 16, 2023, 5:05:14 PM The Kotlin community is buzzing with the release of Kotlin 2.0.0-Beta 1. At the forefront of this... [Read more](https://blog.kotzilla.io/koin-ready-for-kotlin-2.0) [![](https://blog.kotzilla.io/hs-fs/hubfs/Screenshot%202023-10-24%20at%2011.17.33.png?height=200&name=Screenshot%202023-10-24%20at%2011.17.33.png)](https://blog.kotzilla.io/koin-for-kotlin-multiplatform) [Koin](https://blog.kotzilla.io/tag/koin), [Android](https://blog.kotzilla.io/tag/android), [Kotlin](https://blog.kotzilla.io/tag/kotlin), [Dependency Injection](https://blog.kotzilla.io/tag/dependency-injection), [Kotlin Multiplatform](https://blog.kotzilla.io/tag/kotlin-multiplatform), [KMP](https://blog.kotzilla.io/tag/kmp) ## [Koin: The Kotlin Multiplatform (KMP) Dependency Injection Framework](https://blog.kotzilla.io/koin-for-kotlin-multiplatform) [The Koin crew](https://blog.kotzilla.io/author/the-koin-crew) Oct 24, 2023, 1:36:00 PM Do you need to perform dependency injection while working with Kotlin Multiplatform (KMP)? As... 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