--- title: Kotlin 1.9.20: Streamlining Source Sets in Multiplatform... description: Kotlin 1.9.20 moves Kotlin Multiplatform to Stable and introduces a default source set hierarchy template via the Kotlin Gradle Plugin. Key improvements... canonical: https://daily.dev/posts/kotlin-1-9-20-streamlining-source-sets-in-multiplatform-project-y5awuqeyc twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Kotlin 1.9.20: Streamlining Source Sets in Multiplatform Project | daily.dev og:description: Kotlin 1.9.20 moves Kotlin Multiplatform to Stable and introduces a default source set hierarchy template via the Kotlin Gradle Plugin. Key improvements... og:url: https://daily.dev/posts/kotlin-1-9-20-streamlining-source-sets-in-multiplatform-project-y5awuqeyc og:image: https://api.daily.dev/og/posts/y5awUqEyc.png og:image:alt: Kotlin 1.9.20: Streamlining Source Sets in Multiplatform Project og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Kotlin 1.9.20: Streamlining Source Sets in Multiplatform Project **[Touchlab](https://daily.dev/sources/touchlab)** · 4 min read · 0 upvotes · 0 comments ## Summary Kotlin 1.9.20 moves Kotlin Multiplatform to Stable and introduces a default source set hierarchy template via the Kotlin Gradle Plugin. Key improvements include automatic creation of iOS source sets (e.g., iosMain) when targets are declared, simplified custom source set configuration using applyDefaultHierarchyTemplate{} instead of boilerplate 'by creating' syntax, better IDE code completion for predefined source sets, and a cleaner way to configure androidInstrumentedTest dependencies via sourceSetTree. Projects with complex existing hierarchies can opt out by setting kotlin.mpp.applyDefaultHierarchyTemplate=false in gradle.properties. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [A More Reliable Compilation Scheme for Kotlin Multiplatform Modules](https://daily.dev/posts/a-more-reliable-compilation-scheme-for-kotlin-multiplatform-modules-jymr9ynsj) · JetBrains · 2 upvotes · 0 comments - [Kotlin 2.3.20 Released](https://daily.dev/posts/kotlin-2-3-20-released-yhm5cs4jz) · Kotlin · 9 upvotes · 0 comments - [Build Setup: Targets, Source Sets and buildSrc for tvOS in a Compose Multiplatform Fork](https://daily.dev/posts/build-setup-targets-source-sets-and-buildsrc-for-tvos-in-a-compose-multiplatform-fork-xupmuipxk) · ProAndroidDev · 3 upvotes · 0 comments - [Kotlin 2.3.20 harmonizes with C, JavaScript/Typescript](https://daily.dev/posts/kotlin-2-3-20-harmonizes-with-c-javascript-typescript-hddvbwasn) · InfoWorld · 4 upvotes · 0 comments --- Tags: [#ios](https://daily.dev/tags/ios), [#kotlin](https://daily.dev/tags/kotlin), [#gradle](https://daily.dev/tags/gradle) [View this post on daily.dev](https://daily.dev/posts/kotlin-1-9-20-streamlining-source-sets-in-multiplatform-project-y5awuqeyc) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Kotlin 1.9.20: Streamlining Source Sets in Multiplatform Project","url":"https://daily.dev/posts/kotlin-1-9-20-streamlining-source-sets-in-multiplatform-project-y5awuqeyc","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/kotlin-1-9-20-streamlining-source-sets-in-multiplatform-project-y5awuqeyc"},"datePublished":"2026-08-02T07:15:37.781Z","dateModified":"2026-08-02T07:37:58.040Z","description":"Kotlin 1.9.20 moves Kotlin Multiplatform to Stable and introduces a default source set hierarchy template via the Kotlin Gradle Plugin. 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