diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8334ffa..de72948 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: 'zulu'
-          java-version: '19'
+          java-version: '21'
       - uses: gradle/gradle-build-action@v2
         with:
           gradle-home-cache-cleanup: true
@@ -45,7 +45,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: 'zulu'
-          java-version: '19'
+          java-version: '21'
       - uses: gradle/gradle-build-action@v2
         with:
           gradle-home-cache-cleanup: true
@@ -67,7 +67,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: 'zulu'
-          java-version: '19'
+          java-version: '21'
       - uses: gradle/gradle-build-action@v2
         with:
           gradle-home-cache-cleanup: true
diff --git a/.github/workflows/deploy-website.yml b/.github/workflows/deploy-website.yml
index 01f5397..1672c8e 100644
--- a/.github/workflows/deploy-website.yml
+++ b/.github/workflows/deploy-website.yml
@@ -24,7 +24,7 @@ jobs:
       - uses: actions/setup-java@v2
         with:
           distribution: 'zulu'
-          java-version: '19'
+          java-version: '21'
       - uses: gradle/gradle-build-action@v2
         with:
           gradle-home-cache-cleanup: true
diff --git a/build-logic/build.gradle.kts b/build-logic/build.gradle.kts
index 9d548f0..08b7b59 100644
--- a/build-logic/build.gradle.kts
+++ b/build-logic/build.gradle.kts
@@ -9,7 +9,7 @@ plugins {
 
 kotlin {
     jvmToolchain {
-        languageVersion.set(JavaLanguageVersion.of(20))
+        languageVersion.set(JavaLanguageVersion.of(21))
         vendor.set(JvmVendorSpec.AZUL)
     }
 }
diff --git a/build-logic/src/main/kotlin/io/github/reactivecircus/cache4k/buildlogic/convention/ConventionPlugin.kt b/build-logic/src/main/kotlin/io/github/reactivecircus/cache4k/buildlogic/convention/ConventionPlugin.kt
index 3513ba2..a48f4b9 100644
--- a/build-logic/src/main/kotlin/io/github/reactivecircus/cache4k/buildlogic/convention/ConventionPlugin.kt
+++ b/build-logic/src/main/kotlin/io/github/reactivecircus/cache4k/buildlogic/convention/ConventionPlugin.kt
@@ -13,13 +13,9 @@ import org.gradle.api.Project
 import org.gradle.api.tasks.testing.Test
 import org.gradle.jvm.toolchain.JavaLanguageVersion
 import org.gradle.jvm.toolchain.JvmVendorSpec
-import org.gradle.kotlin.dsl.configure
-import org.gradle.kotlin.dsl.register
-import org.gradle.kotlin.dsl.the
-import org.gradle.kotlin.dsl.withType
+import org.gradle.kotlin.dsl.*
 import org.jetbrains.dokka.gradle.DokkaMultiModuleTask
 import org.jetbrains.dokka.gradle.DokkaPlugin
-import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
 import org.jetbrains.kotlin.gradle.dsl.JsModuleKind
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
@@ -111,91 +107,82 @@ private fun Project.configureSubproject() {
 
 @Suppress("LongMethod", "MagicNumber")
 private fun KotlinMultiplatformExtension.configureTargets(project: Project) {
-    targets {
+    jvm {
         jvmToolchain {
-            languageVersion.set(JavaLanguageVersion.of(20))
+            languageVersion.set(JavaLanguageVersion.of(21))
             vendor.set(JvmVendorSpec.AZUL)
         }
-
-        @OptIn(ExperimentalKotlinGradlePluginApi::class)
-        targetHierarchy.default {
-            group("jvmAndIos") {
-                withJvm()
-            }
-            group("nonJvm") {
-                withJs()
-                withIosX64()
-                withIosArm64()
-                withIosSimulatorArm64()
-                withMacosX64()
-                withMacosArm64()
-                withTvosX64()
-                withTvosArm64()
-                withTvosSimulatorArm64()
-                withWatchosX64()
-                withWatchosArm64()
-                withWatchosSimulatorArm64()
-                withLinuxX64()
-                withLinuxArm64()
-                withMingwX64()
+        compilations.configureEach {
+            compilerOptions.configure {
+                jvmTarget.set(JvmTarget.JVM_11)
+                freeCompilerArgs.addAll(
+                    "-Xjvm-default=all"
+                )
             }
         }
-
-        jvm {
-            compilations.configureEach {
-                compilerOptions.configure {
-                    jvmTarget.set(JvmTarget.JVM_11)
-                    freeCompilerArgs.addAll(
-                        "-Xjvm-default=all"
-                    )
+        val main = compilations.getByName("main")
+        compilations.create("lincheck") {
+            defaultSourceSet {
+                dependencies {
+                    implementation(main.compileDependencyFiles + main.output.classesDirs)
                 }
             }
-            val main = compilations.getByName("main")
-            compilations.create("lincheck") {
-                defaultSourceSet {
-                    dependencies {
-                        implementation(main.compileDependencyFiles + main.output.classesDirs)
-                    }
-                }
-                project.tasks.register<Test>("jvmLincheck") {
-                    classpath = compileDependencyFiles + runtimeDependencyFiles + output.allOutputs
-                    testClassesDirs = output.classesDirs
-                    useJUnitPlatform()
-                    testLogging {
-                        events("passed", "skipped", "failed")
-                    }
-                    jvmArgs(
-                        "--add-opens", "java.base/jdk.internal.misc=ALL-UNNAMED",
-                        "--add-opens", "java.base/java.lang=ALL-UNNAMED",
-                        "--add-exports", "java.base/jdk.internal.util=ALL-UNNAMED",
-                        "--add-exports", "java.base/jdk.internal.vm=ALL-UNNAMED",
-                        "--add-exports", "java.base/jdk.internal.access=ALL-UNNAMED",
-                    )
+            project.tasks.register<Test>("jvmLincheck") {
+                classpath = compileDependencyFiles + runtimeDependencyFiles + output.allOutputs
+                testClassesDirs = output.classesDirs
+                useJUnitPlatform()
+                testLogging {
+                    events("passed", "skipped", "failed")
                 }
+                jvmArgs(
+                    "--add-opens", "java.base/jdk.internal.misc=ALL-UNNAMED",
+                    "--add-opens", "java.base/java.lang=ALL-UNNAMED",
+                    "--add-exports", "java.base/jdk.internal.util=ALL-UNNAMED",
+                    "--add-exports", "java.base/jdk.internal.vm=ALL-UNNAMED",
+                    "--add-exports", "java.base/jdk.internal.access=ALL-UNNAMED",
+                )
             }
         }
-        js(IR) {
-            compilations.all {
-                compilerOptions.configure {
-                    moduleKind.set(JsModuleKind.MODULE_COMMONJS)
-                }
+    }
+    js {
+        compilations.configureEach {
+            compilerOptions.configure {
+                moduleKind.set(JsModuleKind.MODULE_COMMONJS)
             }
-            browser()
-            nodejs()
         }
-        iosX64()
-        iosArm64()
-        iosSimulatorArm64()
-        macosX64()
-        macosArm64()
-        tvosX64()
-        tvosArm64()
-        tvosSimulatorArm64()
-        watchosX64()
-        watchosArm64()
-        watchosSimulatorArm64()
-        linuxX64()
-        linuxArm64()
-        mingwX64()
+        browser()
+        nodejs()
+    }
+    iosX64()
+    iosArm64()
+    iosSimulatorArm64()
+    macosX64()
+    macosArm64()
+    tvosX64()
+    tvosArm64()
+    tvosSimulatorArm64()
+    watchosX64()
+    watchosArm64()
+    watchosSimulatorArm64()
+    linuxX64()
+    linuxArm64()
+    mingwX64()
+    applyDefaultHierarchyTemplate()
+
+    sourceSets {
+        val jvmAndIos by creating {
+            dependsOn(commonMain.get())
+        }
+        iosMain.get().dependsOn(jvmAndIos)
+        jvmMain.get().dependsOn(jvmAndIos)
+
+        val nonJvm by creating {
+            dependsOn(commonMain.get())
+        }
+        jsMain.get().dependsOn(nonJvm)
+        appleMain.get().dependsOn(nonJvm)
+        linuxMain.get().dependsOn(nonJvm)
+        mingwMain.get().dependsOn(nonJvm)
+
     }
 }
diff --git a/cache4k/build.gradle.kts b/cache4k/build.gradle.kts
index d0731bc..2376d16 100644
--- a/cache4k/build.gradle.kts
+++ b/cache4k/build.gradle.kts
@@ -4,38 +4,32 @@ plugins {
 
 kotlin {
     sourceSets {
-        val commonMain by getting {
+        commonMain {
             dependencies {
                 implementation(libs.coroutines.core)
                 implementation(libs.stately.isoCollections)
                 implementation(libs.atomicfu)
             }
         }
-        val nonJvmMain by getting {
-            dependencies {
-                dependsOn(commonMain)
-            }
-        }
-        val commonTest by getting {
+        commonTest {
             dependencies {
                 implementation(kotlin("test-common"))
                 implementation(kotlin("test-annotations-common"))
                 implementation(libs.coroutines.test)
             }
         }
-        val jvmTest by getting {
+        jvmTest {
             dependencies {
                 implementation(kotlin("test-junit5"))
             }
         }
-        val jvmLincheck by getting {
+        jvmLincheck {
             dependencies {
-                dependsOn(commonMain)
                 implementation(kotlin("test-junit5"))
                 implementation(libs.lincheck)
             }
         }
-        val jsTest by getting {
+        jsTest {
             dependencies {
                 implementation(kotlin("test-js"))
             }