diff --git a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/Argument.kt b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/Argument.kt
index 6dd21bd..6e24db1 100644
--- a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/Argument.kt
+++ b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/Argument.kt
@@ -188,7 +188,7 @@ private fun burstValuesArguments(
 @UnsafeDuringIrConstructionAPI
 private fun IrExpression.suggestedName(): String? {
   val raw = when (this) {
-    is IrConst<*> -> value.toString()
+    is IrConst -> value.toString()
     is IrCall -> {
       val target = (symbol.owner.correspondingPropertySymbol?.owner ?: symbol.owner)
       target.name.asString()
@@ -214,7 +214,7 @@ private fun enumValueArguments(
     val expression = defaultValue.expression
     when {
       expression is IrGetEnumValue -> expression.symbol.owner.name
-      expression is IrConst<*> && expression.value == null -> null
+      expression is IrConst && expression.value == null -> null
       else -> unexpectedDefaultValue(parameter)
     }
   }
@@ -249,7 +249,7 @@ private fun IrPluginContext.booleanArguments(
   val defaultValue = parameter.defaultValue?.let { defaultValue ->
     val expression = defaultValue.expression
     when {
-      expression is IrConst<*> -> expression.value
+      expression is IrConst -> expression.value
       else -> unexpectedDefaultValue(parameter)
     }
   }
diff --git a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ClassSpecializer.kt b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ClassSpecializer.kt
index cbd7655..7960878 100644
--- a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ClassSpecializer.kt
+++ b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ClassSpecializer.kt
@@ -143,7 +143,6 @@ internal class ClassSpecializer(
         statements += irDelegatingConstructorCall(
           context = pluginContext,
           symbol = superConstructor.symbol,
-          valueArgumentsCount = specialization.arguments.size,
         ) {
           for ((index, argument) in specialization.arguments.withIndex()) {
             putValueArgument(index, argument.expression())
@@ -172,7 +171,6 @@ internal class ClassSpecializer(
         statements += irDelegatingConstructorCall(
           context = pluginContext,
           symbol = superConstructor.symbol,
-          valueArgumentsCount = specialization.arguments.size,
         ) {
           for ((index, argument) in specialization.arguments.withIndex()) {
             putValueArgument(index, argument.expression())
diff --git a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ir.kt b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ir.kt
index 2efa0b7..0276347 100644
--- a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ir.kt
+++ b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/ir.kt
@@ -43,6 +43,7 @@ import org.jetbrains.kotlin.ir.expressions.IrInstanceInitializerCall
 import org.jetbrains.kotlin.ir.expressions.impl.IrConstructorCallImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrDelegatingConstructorCallImpl
 import org.jetbrains.kotlin.ir.expressions.impl.IrInstanceInitializerCallImpl
+import org.jetbrains.kotlin.ir.expressions.impl.fromSymbolOwner
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
@@ -141,7 +142,6 @@ fun DeclarationIrBuilder.irDelegatingConstructorCall(
   context: IrGeneratorContext,
   symbol: IrConstructorSymbol,
   typeArgumentsCount: Int = 0,
-  valueArgumentsCount: Int = 0,
   block: IrDelegatingConstructorCall.() -> Unit = {},
 ): IrDelegatingConstructorCall {
   val result = IrDelegatingConstructorCallImpl(
@@ -150,7 +150,6 @@ fun DeclarationIrBuilder.irDelegatingConstructorCall(
     type = context.irBuiltIns.unitType,
     symbol = symbol,
     typeArgumentsCount = typeArgumentsCount,
-    valueArgumentsCount = valueArgumentsCount,
   )
   result.block()
   return result
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 63453be..eadb06c 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-kotlin = "2.0.21"
+kotlin = "2.1.0"
 
 [libraries]
 android-gradlePlugin = "com.android.tools.build:gradle:8.7.2"
@@ -8,10 +8,10 @@ auto-service-annotations = { module = "com.google.auto.service:auto-service-anno
 auto-service-compiler = { module = "dev.zacsweers.autoservice:auto-service-ksp", version = "1.2.0" }
 binary-compatibility-validator-gradle-plugin = { module = "org.jetbrains.kotlinx.binary-compatibility-validator:org.jetbrains.kotlinx.binary-compatibility-validator.gradle.plugin", version = "0.16.3" }
 dokka-gradle-plugin = { module = "org.jetbrains.dokka:dokka-gradle-plugin", version = "1.9.20" }
-google-ksp = "com.google.devtools.ksp:symbol-processing-gradle-plugin:2.0.21-1.0.28"
+google-ksp = "com.google.devtools.ksp:symbol-processing-gradle-plugin:2.1.0-1.0.29"
 junit = { module = "junit:junit", version = "4.13.2" }
 junit-vintage-engine = { module = "org.junit.vintage:junit-vintage-engine", version = "5.11.3" }
-kotlin-compile-testing = { module = "dev.zacsweers.kctfork:core", version = "0.6.0" }
+kotlin-compile-testing = { module = "dev.zacsweers.kctfork:core", version = "0.7.0" }
 kotlin-gradlePlugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test" }
 mavenPublish-gradle-plugin = { module = "com.vanniktech:gradle-maven-publish-plugin", version = "0.30.0" }
diff --git a/kotlin-js-store/yarn.lock b/kotlin-js-store/yarn.lock
index 881fd5c..cb4b541 100644
--- a/kotlin-js-store/yarn.lock
+++ b/kotlin-js-store/yarn.lock
@@ -274,6 +274,13 @@ js-yaml@^4.1.0:
   dependencies:
     argparse "^2.0.1"
 
+kotlin-web-helpers@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/kotlin-web-helpers/-/kotlin-web-helpers-2.0.0.tgz#b112096b273c1e733e0b86560998235c09a19286"
+  integrity sha512-xkVGl60Ygn/zuLkDPx+oHj7jeLR7hCvoNF99nhwXMn8a3ApB4lLiC9pk4ol4NHPjyoCbvQctBqvzUcp8pkqyWw==
+  dependencies:
+    format-util "^1.0.5"
+
 locate-path@^6.0.0:
   version "6.0.0"
   resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-6.0.0.tgz#55321eb309febbc59c4801d931a72452a681d286"
@@ -296,10 +303,10 @@ minimatch@^5.0.1, minimatch@^5.1.6:
   dependencies:
     brace-expansion "^2.0.1"
 
-mocha@10.7.0:
-  version "10.7.0"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-10.7.0.tgz#9e5cbed8fa9b37537a25bd1f7fb4f6fc45458b9a"
-  integrity sha512-v8/rBWr2VO5YkspYINnvu81inSz2y3ODJrhO175/Exzor1RcEZZkizgE2A+w/CAXXoESS8Kys5E62dOHGHzULA==
+mocha@10.7.3:
+  version "10.7.3"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-10.7.3.tgz#ae32003cabbd52b59aece17846056a68eb4b0752"
+  integrity sha512-uQWxAu44wwiACGqjbPYmjo7Lg8sFrS3dQe7PP2FQI+woptP4vZXSMcfMyFL/e1yFEeEpV4RtyTpZROOKmxis+A==
   dependencies:
     ansi-colors "^4.1.3"
     browser-stdout "^1.3.1"