diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 6d9f9c6..0ff73e5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -15,9 +15,9 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '11'
+          java-version: '17'
       - name: Checkout
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
       - name: Publish
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a5c774b..85283f8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,9 +12,9 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '11'
+          java-version: '17'
       - name: Checkout
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+        uses: actions/checkout@v4
       - name: Run tests
         uses: burrunan/gradle-cache-action@v1
         with:
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 372a9f9..43c5758 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -15,6 +15,6 @@ dependencies {
 
 kotlin {
     jvmToolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
+        languageVersion.set(JavaLanguageVersion.of(17))
     }
 }
diff --git a/buildSrc/src/main/kotlin/kotlin.gradle.kts b/buildSrc/src/main/kotlin/kotlin.gradle.kts
index 6d97e83..7bf9bca 100644
--- a/buildSrc/src/main/kotlin/kotlin.gradle.kts
+++ b/buildSrc/src/main/kotlin/kotlin.gradle.kts
@@ -4,6 +4,6 @@ plugins {
 
 kotlin {
     jvmToolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
+        languageVersion.set(JavaLanguageVersion.of(17))
     }
 }
\ No newline at end of file
diff --git a/buildSrc/src/main/kotlin/release.gradle.kts b/buildSrc/src/main/kotlin/release.gradle.kts
index 2f2749c..f694429 100644
--- a/buildSrc/src/main/kotlin/release.gradle.kts
+++ b/buildSrc/src/main/kotlin/release.gradle.kts
@@ -23,7 +23,7 @@ tasks.register("publish") {
 
 tasks.register<Delete>("clean") {
     group = "build"
-    delete = setOf(buildDir)
+    delete = setOf(layout.buildDirectory)
 }
 
 nexusPublishing {
diff --git a/gradle.properties b/gradle.properties
index 00547ea..05983f5 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 kotlin.code.style=official
-org.gradle.jvmargs=-Xmx4096m -XX:MaxPermSize=1024m
+org.gradle.jvmargs=-Xmx4096m
 kapt.includeCompileClasspath=false
 
 group=com.faendir.kotlin.autodsl
\ No newline at end of file
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index f18ef6d..357da77 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,15 +1,14 @@
 [versions]
-kotlin = "1.9.0"
+kotlin = "1.9.23"
 dokka = "1.9.20"
 jgitver = "0.10.0-rc03"
 nexusPublish = "2.0.0"
-ksp = "1.9.0-1.0.11"
-kotlinPoet = "1.14.2"
+ksp = "1.9.23-1.0.19"
+kotlinPoet = "1.16.0"
 kotlinBard = "0.5.1"
-compileTesting = "1.5.0"
+compileTesting = "0.4.1"
 junit = "5.10.2"
 strikt = "0.34.1"
-autoCommon = "1.1.2"
 intellijPlugin = "1.17.3"
 
 [plugins]
@@ -27,5 +26,5 @@ dokka-core = { module = "org.jetbrains.dokka:dokka-core", version.ref = "dokka"
 jgitver = { module = "gradle.plugin.fr.brouillard.oss.gradle:gradle-jgitver-plugin", version.ref = "jgitver" }
 nexusPublish = { module = "io.github.gradle-nexus:publish-plugin", version.ref = "nexusPublish" }
 junit = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }
-kotlin-compileTesting = { module = "com.github.tschuchortdev:kotlin-compile-testing-ksp", version.ref = "compileTesting" }
+kotlin-compileTesting = { module = "dev.zacsweers.kctfork:ksp", version.ref = "compileTesting" }
 strikt = { module = "io.strikt:strikt-core", version.ref = "strikt" }
\ No newline at end of file
diff --git a/processor/build.gradle.kts b/processor/build.gradle.kts
index a30a9ee..615dfe6 100644
--- a/processor/build.gradle.kts
+++ b/processor/build.gradle.kts
@@ -10,5 +10,26 @@ dependencies {
     implementation(libs.kotlinpoet.ksp)
     implementation(libs.kotlinpoet.metadata)
     implementation(libs.kotlinbard)
-    implementation(kotlin("compiler-embeddable", "1.8.0"))
+    implementation(kotlin("compiler-embeddable"))
+}
+
+kotlin.sourceSets.all {
+    languageSettings.optIn("org.jetbrains.kotlin.compiler.plugin.ExperimentalCompilerApi")
+}
+
+if (JavaVersion.current() >= JavaVersion.VERSION_16) {
+    tasks.withType<Test> {
+        jvmArgs(
+            "--add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED",
+            "--add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
+        )
+    }
 }
diff --git a/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptCodeWriter.kt b/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptCodeWriter.kt
index e9551bb..49df79e 100644
--- a/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptCodeWriter.kt
+++ b/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptCodeWriter.kt
@@ -4,16 +4,16 @@ import com.faendir.kotlin.autodsl.CodeWriter
 import com.squareup.kotlinpoet.FileSpec
 import java.io.File
 import javax.annotation.processing.ProcessingEnvironment
-import javax.lang.model.element.Element
-import javax.lang.model.element.TypeElement
 import javax.tools.Diagnostic
 
 class KaptCodeWriter(processingEnv: ProcessingEnvironment) : CodeWriter<Type> {
-    private val dir : File = processingEnv.options["kapt.kotlin.generated"]?.let { File(it) }
+    private val dir: File = processingEnv.options["kapt.kotlin.generated"]?.let { File(it) }
         ?: run {
             processingEnv.messager.printMessage(Diagnostic.Kind.ERROR, "Can't find the target directory for generated Kotlin files. Are you using kapt?")
             throw IllegalStateException()
         }
 
-    override fun emit(source: Type, fileSpec: FileSpec) = fileSpec.writeTo(dir)
+    override fun emit(source: Type, fileSpec: FileSpec) {
+        fileSpec.writeTo(dir)
+    }
 }
\ No newline at end of file
diff --git a/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptSourceInfoResolver.kt b/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptSourceInfoResolver.kt
index 566a6fb..e85e46d 100644
--- a/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptSourceInfoResolver.kt
+++ b/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/KaptSourceInfoResolver.kt
@@ -7,10 +7,16 @@ import com.faendir.kotlin.autodsl.nonnull
 import com.google.devtools.ksp.symbol.ClassKind
 import com.squareup.kotlinpoet.*
 import com.squareup.kotlinpoet.metadata.*
-import kotlinx.metadata.Flag
 import kotlinx.metadata.KmClass
 import kotlinx.metadata.KmConstructor
 import kotlinx.metadata.KmValueParameter
+import kotlinx.metadata.Modality
+import kotlinx.metadata.Visibility
+import kotlinx.metadata.declaresDefaultValue
+import kotlinx.metadata.isSecondary
+import kotlinx.metadata.kind
+import kotlinx.metadata.modality
+import kotlinx.metadata.visibility
 import javax.annotation.processing.ProcessingEnvironment
 import javax.annotation.processing.RoundEnvironment
 import javax.lang.model.element.ElementKind
@@ -30,14 +36,14 @@ class KaptSourceInfoResolver(private val processingEnv: ProcessingEnvironment, p
     override fun getClassesWithAnnotation(annotation: Type): List<Type> =
         roundEnv.getElementsAnnotatedWith(annotation.element).filterIsInstance<TypeElement>().map { Type(it) }
 
-    override fun Type.getClassKind(): ClassKind = when {
-        kmClass.isEnum -> ClassKind.ENUM_CLASS
-        kmClass.isAnnotation -> ClassKind.ANNOTATION_CLASS
-        kmClass.isInterface -> ClassKind.INTERFACE
-        kmClass.isEnumEntry -> ClassKind.ENUM_ENTRY
-        kmClass.isClass -> ClassKind.CLASS
-        kmClass.isObject -> ClassKind.OBJECT
-        else -> throw IllegalArgumentException()
+    override fun Type.getClassKind(): ClassKind = when(kmClass.kind) {
+        kotlinx.metadata.ClassKind.CLASS -> ClassKind.CLASS
+        kotlinx.metadata.ClassKind.INTERFACE -> ClassKind.INTERFACE
+        kotlinx.metadata.ClassKind.ENUM_CLASS -> ClassKind.ENUM_CLASS
+        kotlinx.metadata.ClassKind.ENUM_ENTRY -> ClassKind.ENUM_ENTRY
+        kotlinx.metadata.ClassKind.ANNOTATION_CLASS -> ClassKind.ANNOTATION_CLASS
+        kotlinx.metadata.ClassKind.OBJECT -> ClassKind.OBJECT
+        kotlinx.metadata.ClassKind.COMPANION_OBJECT -> ClassKind.OBJECT
     }
 
     override fun <T : Annotation> Annotated.getAnnotationTypeProperty(annotation: KClass<T>, property: KProperty1<T, KClass<*>>): ClassName? = try {
@@ -51,7 +57,7 @@ class KaptSourceInfoResolver(private val processingEnv: ProcessingEnvironment, p
     override fun <T : Annotation, V> Annotated.getAnnotationProperty(annotation: KClass<T>, property: KProperty1<T, V>): V? =
         getAnnotation(annotation)?.let(property)
 
-    override fun Type.isAbstract(): Boolean = Flag.IS_ABSTRACT(kmClass.flags)
+    override fun Type.isAbstract(): Boolean = kmClass.modality == Modality.ABSTRACT
 
     override fun Type.getConstructors(): List<Constructor> {
         val constructorElements = element.enclosedElements.filterIsInstance<ExecutableElement>().filter { it.kind == ElementKind.CONSTRUCTOR }.toMutableList()
@@ -71,9 +77,9 @@ class KaptSourceInfoResolver(private val processingEnv: ProcessingEnvironment, p
         }.map { (kmConstructor, element) -> Constructor(element, kmConstructor) }
     }
 
-    override fun Constructor.isAccessible(): Boolean = Flag.IS_PUBLIC(kmConstructor.flags) || Flag.IS_INTERNAL(kmConstructor.flags)
+    override fun Constructor.isAccessible(): Boolean = kmConstructor.visibility in listOf(Visibility.PUBLIC, Visibility.INTERNAL)
 
-    override fun Type.getPrimaryConstructor(): Constructor? = getConstructors().find { it.kmConstructor.isPrimary }
+    override fun Type.getPrimaryConstructor(): Constructor? = getConstructors().find { !it.kmConstructor.isSecondary }
 
     override fun Constructor.isValid(): Boolean = true
 
@@ -82,6 +88,7 @@ class KaptSourceInfoResolver(private val processingEnv: ProcessingEnvironment, p
 
     override fun Type.asClassName(): ClassName = kmClass.asClassName()
 
+    @OptIn(KotlinPoetMetadataPreview::class)
     override fun Parameter.getTypeDeclaration(): Type? {
         val element = processingEnv.typeUtils.asElement(element.asType()) as? TypeElement
         val kmType = try {
diff --git a/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/utils.kt b/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/utils.kt
index dc75ed0..7adea98 100644
--- a/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/utils.kt
+++ b/processor/src/main/kotlin/com/faendir/kotlin/autodsl/kapt/utils.kt
@@ -2,7 +2,6 @@ package com.faendir.kotlin.autodsl.kapt
 
 import com.squareup.kotlinpoet.*
 import com.squareup.kotlinpoet.ParameterizedTypeName.Companion.parameterizedBy
-import io.github.enjoydambience.kotlinbard.nullable
 import org.jetbrains.kotlin.builtins.jvm.JavaToKotlinClassMap
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
diff --git a/processor/src/test/kotlin/com/faendir/kotlin/autodsl/compileutils.kt b/processor/src/test/kotlin/com/faendir/kotlin/autodsl/compileutils.kt
index 3284001..ca2f326 100644
--- a/processor/src/test/kotlin/com/faendir/kotlin/autodsl/compileutils.kt
+++ b/processor/src/test/kotlin/com/faendir/kotlin/autodsl/compileutils.kt
@@ -2,6 +2,7 @@ package com.faendir.kotlin.autodsl
 
 import com.faendir.kotlin.autodsl.kapt.KaptProcessor
 import com.faendir.kotlin.autodsl.ksp.KspProcessorProvider
+import com.tschuchort.compiletesting.JvmCompilationResult
 import com.tschuchort.compiletesting.KotlinCompilation
 import com.tschuchort.compiletesting.SourceFile.Companion.fromPath
 import com.tschuchort.compiletesting.SourceFile.Companion.kotlin
@@ -14,10 +15,10 @@ import strikt.assertions.isEqualTo
 import java.io.File
 import kotlin.test.assertNotNull
 
-internal val KotlinCompilation.Result.workingDir: File
+internal val JvmCompilationResult.workingDir: File
     get() = outputDirectory.parentFile!!
 
-val KotlinCompilation.Result.kspGeneratedSources: List<File>
+val JvmCompilationResult.kspGeneratedSources: List<File>
     get() = workingDir.resolve("ksp/sources/kotlin").collectSourceFiles()
 
 private fun File.collectSourceFiles(): List<File> {
@@ -50,13 +51,13 @@ fun compileKsp(
         symbolProcessorProviders = listOf(KspProcessorProvider())
     }
     val pass1 = compilation.compile()
-    expectThat(pass1).get(KotlinCompilation.Result::exitCode).isEqualTo(expect)
+    expectThat(pass1).get(JvmCompilationResult::exitCode).isEqualTo(expect)
     val pass2 = KotlinCompilation().apply {
         inheritClassPath = true
         jvmTarget = "1.8"
         sources = compilation.sources + pass1.kspGeneratedSources.map { fromPath(it) } + kotlin("Eval.kt", eval)
     }.compile()
-    expectThat(pass2).get(KotlinCompilation.Result::exitCode).isEqualTo(KotlinCompilation.ExitCode.OK)
+    expectThat(pass2).get(JvmCompilationResult::exitCode).isEqualTo(KotlinCompilation.ExitCode.OK)
     pass2.callEval()
     return pass1.kspGeneratedSources
 }
@@ -72,14 +73,14 @@ fun compileKapt(
         sources = listOf(kotlin("Source.kt", source), kotlin("Eval.kt", eval))
         annotationProcessors = listOf(KaptProcessor())
     }.compile()
-    expectThat(result).get(KotlinCompilation.Result::exitCode).isEqualTo(expect)
+    expectThat(result).get(JvmCompilationResult::exitCode).isEqualTo(expect)
     if (expect == KotlinCompilation.ExitCode.OK) {
         result.callEval()
     }
     return result.generatedFiles.filter { it.extension == "kt" }
 }
 
-private fun KotlinCompilation.Result.callEval() = classLoader.loadClass("EvalKt").declaredMethods
+private fun JvmCompilationResult.callEval() = classLoader.loadClass("EvalKt").declaredMethods
     .first { it.name[0] != '$' /* skip jacoco added function */ }
     .run {
         isAccessible = true
diff --git a/renovate.json b/renovate.json
index 5f12ca7..40a4ac7 100644
--- a/renovate.json
+++ b/renovate.json
@@ -20,7 +20,7 @@
       "automergeType": "branch"
     },
     {
-      "matchPackagePatterns": ["^org\\.jetbrains\\.kotlin", "^com\\.google\\.devtools\\.ksp"],
+      "matchPackagePatterns": ["^org\\.jetbrains\\.kotlin", "^com\\.google\\.devtools\\.ksp", "^dev\\.zacsweers\\.kctfork"],
       "groupName": "kotlin"
     }
   ]
diff --git a/sample-ksp/build.gradle.kts b/sample-ksp/build.gradle.kts
index a19adf7..19b05b3 100644
--- a/sample-ksp/build.gradle.kts
+++ b/sample-ksp/build.gradle.kts
@@ -8,16 +8,3 @@ dependencies {
     implementation(projects.annotations)
     ksp(projects.processor)
 }
-
-sourceSets {
-    main {
-        java {
-            srcDir(file("$buildDir/generated/ksp/main/kotlin"))
-        }
-    }
-    test {
-        java {
-            srcDir(file("$buildDir/generated/ksp/test/kotlin"))
-        }
-    }
-}