Kotlin 1.7.20 Released

Andrey Polyakov

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The Kotlin 1.7.20 release is out! Here are some highlights from this release:

• The new Kotlin K2 compiler supports all-open, no-arg, Lombok, and other compiler plugins.
• We introduced the preview of the ..< operator for creating open-ended ranges.
• The new Kotlin/Native memory manager is enabled by default.
• We introduced a new experimental feature for JVM: inline classes with generic underlying type.
• We announced support for Gradle 7.1.

For the complete list of changes, refer to What’s new in Kotlin 1.7.20 or release notes on GitHub.

How to install Kotlin 1.7.20

If you already use IntelliJ IDEA 2021.3, 2022.1, or 2022.2, the IDE will suggest updating Kotlin to 1.7.20 automatically. You can also update manually by following these instructions.

For Android Studio Dolphin (213), Electric Eel (221), and Flamingo (222), the Kotlin plugin 1.7.20 will be delivered with upcoming Android Studios updates.

If you need the command-line compiler, download it from the GitHub release page.

If you run into any problems

• Find help on Slack (get an invite).
• Report issues to our issue tracker, YouTrack.

Special thanks to our EAP Champions 🥇👏

As part of our effort to maximize the release quality of Kotlin 1.7.20, we launched an experimental program where we invited people working on production-grade Kotlin projects to migrate them to the new version. While validating their projects on 1.7.20-Beta and 1.7.20-RC, they reported issues and helped us stabilize the release. For example, they discovered a major issue with the new Kotlin/Native memory model and several issues with the compatibility of Kotlin compiler plugins. These people are our EAP Champions and we want to give a big thank you to them:

• Zac Sweers
• Alexander Nozik
• Ahmed Moussa
• Russel Wolf
• Ankush Gupta

What else to read and watch

• What’s new in Kotlin 1.7.20 documentation
• What’s new in Kotlin 1.7.20 on YouTube
• Compatibility guide for Kotlin 1.7.20

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