releases.md

We ship different types of releases:

• Feature releases (1.x) that bring major changes in the language.
• Incremental releases (1.x.y) that are shipped between feature releases and include updates in the tooling, performance improvements, and bug fixes.
• Bug fix releases (1.x.yz) that include bug fixes for incremental releases.

For example, for the feature release 1.3 we had several incremental releases including 1.3.10, 1.3.20, and 1.3.70. For 1.3.70, we had 2 bug fix releases – 1.3.71 and 1.3.72.

For each incremental and feature release, we also ship several preview (EAP) versions for you to try new features before they are released. See Early Access Preview for details.

Learn more about types of Kotlin releases and their compatiblity.

Update to a new release

IntelliJ IDEA and Android Studio suggest updating to a new release once it is out. When you accept the suggestion, it automatically updates the Kotlin plugin to the new version. You can check the Kotlin version in Tools | Kotlin | Configure Kotlin Plugin Updates.

If you have projects created with earlier Kotlin versions, change the Kotlin version in your projects and update kotlinx libraries if necessary – check the recommended versions.

If you are migrating to the new feature release, Kotlin plugin's migration tools will help you with the migration.

IDE support

The IDE support for the latest version of the language is available for the following versions of IntelliJ IDEA and Android Studio:

• IntelliJ IDEA:
  • Latest stable (IntelliJ IDEA %kotlinPluginVersion% version)
  • Previous stable (IntelliJ IDEA %kotlinPreviousPluginVersion% version)
  • Early access versions
• Android Studio:
  • Latest released version
  • Early access versions

Release details

The following table lists details of latest Kotlin releases.

You can also use preview versions of Kotlin.

Build info	Build highlights	Recommended kotlinx library versions
1.5.31 Released: September 20, 2021 Release on GitHub	A bug fix release for Kotlin 1.5.30. Learn more about Kotlin 1.5.30.	kotlinx.serialization version: 1.3.0-RC kotlinx.coroutines version: 1.5.2 kotlinx.atomicfu version: 0.16.3 ktor version: 1.6.3 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.5.30 Released: August 23, 2021 Release on GitHub	An incremental release with various improvements such as: Instantiation of annotation classes on JVM Improved opt-in requirement mechanism and type inference Kotlin/JS IR backend in Beta Support for Apple Silicon targets Improved CocoaPods support Gradle: Java toolchain support and improved daemon configuration Learn more in: Release blog post What's new in Kotlin 1.5.30	kotlinx.serialization version: 1.3.0-RC kotlinx.coroutines version: 1.5.1 kotlinx.atomicfu version: 0.16.2 ktor version: 1.6.2 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.5.21 Released: July 13, 2021 Release on GitHub	A bug fix release for Kotlin 1.5.20. Learn more about Kotlin 1.5.20.	kotlinx.serialization version: 1.2.1 kotlinx.coroutines version: 1.5.0 kotlinx.atomicfu version: 0.16.1 ktor version: 1.6.0 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.5.20 Released: June 24, 2021 Release on GitHub	An incremental release with various improvements such as: String concatenation via invokedynamic on JVM by default Improved support for Lombok and support for JSpecify Kotlin/Native: KDoc export to Objective-C headers and faster Array.copyInto() inside one array Gradle: caching of annotation processors' classloaders and support for the --parallel Gradle property Aligned behavior of stdlib functions across platforms Learn more in: Release blog post What's new in Kotlin 1.5.20	kotlinx.serialization version: 1.2.1 kotlinx.coroutines version: 1.5.0 kotlinx.atomicfu version: 0.16.1 ktor version: 1.6.0 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.5.10 Released: May 24, 2021 Release on GitHub	A bug fix release for Kotlin 1.5.0. Learn more about Kotlin 1.5.0.	kotlinx.serialization version: 1.2.1 kotlinx.coroutines version: 1.5.0 kotlinx.atomicfu version: 0.16.1 ktor version: 1.5.4 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.5.0 Released: May 5, 2021 Release on GitHub	A feature release with new language features, performance improvements, and evolutionary changes such as stabilizing experimental APIs. Learn more in: Release blog post What's new in Kotlin 1.5.0 Compatibility Guide	kotlinx.serialization version: 1.2.1 kotlinx.coroutines version: 1.5.0-RC kotlinx.atomicfu version: 0.16.1 ktor version: 1.5.3 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.4.32 Released: March 22, 2021 Release on GitHub	A bug fix release for Kotlin 1.4.30. Learn more about Kotlin 1.4.30.	kotlinx.serialization version: 1.1.0 kotlinx.coroutines version: 1.4.3 kotlinx.atomicfu version: 0.15.2 ktor version: 1.5.2 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.4.31 Released: February 25, 2021 Release on GitHub	A bug fix release for Kotlin 1.4.30 Learn more about Kotlin 1.4.30.	kotlinx.serialization version: 1.1.0 kotlinx.coroutines version: 1.4.2 kotlinx.atomicfu version: 0.15.1 ktor version: 1.5.1 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.4.30 Released: February 3, 2021 Release on GitHub	An incremental release with various improvements such as: New JVM backend, now in Beta Preview of new language features Improved Kotlin/Native performance Standard library API improvements Learn more in: Release blog post What's new in Kotlin 1.4.30	kotlinx.serialization version: 1.1.0-RC kotlinx.coroutines version: 1.4.2 kotlinx.atomicfu version: 0.15.1 ktor version: 1.5.1 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.7 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.4.21 Released: December 7, 2020 Release on GitHub	A bug fix release for Kotlin 1.4.20 Learn more about Kotlin 1.4.20.	kotlinx.serialization version: 1.0.1 kotlinx.coroutines version: 1.4.1 kotlinx.atomicfu version: 0.14.4 ktor version: 1.4.1 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.6 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.4.20 Released: November 23, 2020 Release on GitHub	An incremental release with various improvements such as: Supporting new JVM features, like string concatenation via invokedynamic Improved performance and exception handling for KMM projects Extensions for JDK Path: Path(“dir”) / “file.txt” Learn more in: Release blog post What's new in Kotlin 1.4.20	kotlinx.serialization version: 1.0.1 kotlinx.coroutines version: 1.4.1 kotlinx.atomicfu version: 0.14.4 ktor version: 1.4.1 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.6 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.4.10 Released: September 7, 2020 Release on GitHub	A bug fix release for Kotlin 1.4.0. Learn more about Kotlin 1.4.0.	kotlinx.serialization version: 1.0.0-RC kotlinx.coroutines version: 1.3.9 kotlinx.atomicfu version: 0.14.4 ktor version: 1.4.0 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.6 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.4.0 Released: August 17, 2020 Release on GitHub	A feature release with many features and improvements that mostly focus on quality and performance. Learn more in: Release blog post What's new in Kotlin 1.4.0 Compatibility Guide Migrating to Kotlin 1.4.0	kotlinx.serialization version: 1.0.0-RC kotlinx.coroutines version: 1.3.9 kotlinx.atomicfu version: 0.14.4 ktor version: 1.4.0 kotlinx.html version: 0.7.2 kotlinx-nodejs version: 0.0.6 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.
1.3.72 Released: April 15, 2020 Release on GitHub	A bug fix release for Kotlin 1.3.70. Learn more about Kotlin 1.3.70.	kotlinx.serialization version: 0.20.0 kotlinx.coroutines version: 1.3.8 kotlinx.atomicfu version: 0.14.2 ktor version: 1.3.2 kotlinx.html version: 0.7.1 kotlinx-nodejs version: 0.0.3 The versions of libraries from kotlin-wrappers (such as kotlin-react) can be found in the corresponding repository.

On the JVM, you usually can use library versions other than the recommended ones.

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