diff --git a/build.gradle.kts b/build.gradle.kts
index 2a69c281aba..5285ccda281 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-  kotlin("jvm") version "1.5.20" apply false
+  kotlin("jvm") version "1.6.0" apply false
   id("org.jetbrains.dokka") version "0.10.0" apply false
   id("com.gradle.plugin-publish") version "0.11.0" apply false
   id("com.github.gmazzo.buildconfig") version "2.0.2" apply false
diff --git a/kotlin-power-assert-plugin-native/build.gradle.kts b/kotlin-power-assert-plugin-native/build.gradle.kts
index 8184c3fef1d..3a364ce6e83 100644
--- a/kotlin-power-assert-plugin-native/build.gradle.kts
+++ b/kotlin-power-assert-plugin-native/build.gradle.kts
@@ -12,8 +12,8 @@ plugins {
 dependencies {
   compileOnly("org.jetbrains.kotlin:kotlin-compiler")
 
-  kapt("com.google.auto.service:auto-service:1.0-rc6")
-  compileOnly("com.google.auto.service:auto-service-annotations:1.0-rc6")
+  kapt("com.google.auto.service:auto-service:1.0.1")
+  compileOnly("com.google.auto.service:auto-service-annotations:1.0.1")
 }
 
 tasks.named("compileKotlin") { dependsOn("syncSource") }
diff --git a/kotlin-power-assert-plugin/build.gradle.kts b/kotlin-power-assert-plugin/build.gradle.kts
index 36bc718981f..eedd1cb82d7 100644
--- a/kotlin-power-assert-plugin/build.gradle.kts
+++ b/kotlin-power-assert-plugin/build.gradle.kts
@@ -12,12 +12,12 @@ plugins {
 dependencies {
   compileOnly("org.jetbrains.kotlin:kotlin-compiler-embeddable")
 
-  kapt("com.google.auto.service:auto-service:1.0-rc6")
-  compileOnly("com.google.auto.service:auto-service-annotations:1.0-rc6")
+  kapt("com.google.auto.service:auto-service:1.0.1")
+  compileOnly("com.google.auto.service:auto-service-annotations:1.0.1")
 
   testImplementation(kotlin("test-junit"))
   testImplementation("org.jetbrains.kotlin:kotlin-compiler-embeddable")
-  testImplementation("com.github.tschuchortdev:kotlin-compile-testing:1.2.6")
+  testImplementation("com.github.tschuchortdev:kotlin-compile-testing:1.4.6")
 }
 
 tasks.withType<KotlinCompile> {
diff --git a/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/PowerAssertCallTransformer.kt b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/PowerAssertCallTransformer.kt
index 84fbd03e04a..f3a838fe779 100644
--- a/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/PowerAssertCallTransformer.kt
+++ b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/PowerAssertCallTransformer.kt
@@ -52,6 +52,7 @@ import org.jetbrains.kotlin.ir.types.IrSimpleType
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.IrTypeArgument
 import org.jetbrains.kotlin.ir.types.IrTypeProjection
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl
 import org.jetbrains.kotlin.ir.types.classifierOrNull
 import org.jetbrains.kotlin.ir.types.isBoolean
 import org.jetbrains.kotlin.ir.types.isSubtypeOf
@@ -68,6 +69,8 @@ class PowerAssertCallTransformer(
   private val messageCollector: MessageCollector,
   private val functions: Set<FqName>
 ) : IrElementTransformerVoidWithContext() {
+  private val irTypeSystemContext = IrTypeSystemContextImpl(context.irBuiltIns)
+
   override fun visitCall(expression: IrCall): IrExpression {
     val function = expression.symbol.owner
     val fqName = function.kotlinFqName
@@ -200,12 +203,12 @@ class PowerAssertCallTransformer(
     argument is IrTypeProjection && isStringSupertype(argument.type)
 
   private fun isStringSupertype(type: IrType): Boolean =
-    context.irBuiltIns.stringType.isSubtypeOf(type, context.irBuiltIns)
+    context.irBuiltIns.stringType.isSubtypeOf(type, irTypeSystemContext)
 
   private fun IrType.isAssignableTo(type: IrType): Boolean {
-    if (isSubtypeOf(type, context.irBuiltIns)) return true
+    if (isSubtypeOf(type, irTypeSystemContext)) return true
     val superTypes = (type.classifierOrNull as? IrTypeParameterSymbol)?.owner?.superTypes
-    return superTypes != null && superTypes.all { isSubtypeOf(it, context.irBuiltIns) }
+    return superTypes != null && superTypes.all { isSubtypeOf(it, irTypeSystemContext) }
   }
 
   private fun MessageCollector.info(expression: IrElement, message: String) {
diff --git a/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/diagram/IrDiagram.kt b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/diagram/IrDiagram.kt
index 4fd29c33c16..87db4016fbf 100644
--- a/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/diagram/IrDiagram.kt
+++ b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/diagram/IrDiagram.kt
@@ -17,6 +17,7 @@
 package com.bnorm.power.diagram
 
 import com.bnorm.power.irString
+import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.SourceRangeInfo
 import org.jetbrains.kotlin.ir.builders.IrBuilderWithScope
@@ -25,7 +26,6 @@ import org.jetbrains.kotlin.ir.builders.irGet
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.declarations.IrVariable
-import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.expressions.IrConst
 import org.jetbrains.kotlin.ir.expressions.IrConstKind
 import org.jetbrains.kotlin.ir.expressions.IrExpression
diff --git a/sample/build.gradle.kts b/sample/build.gradle.kts
index 14106290daa..a04d188e7df 100644
--- a/sample/build.gradle.kts
+++ b/sample/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-  kotlin("multiplatform") version "1.5.20"
+  kotlin("multiplatform") version "1.6.0"
   id("com.bnorm.power.kotlin-power-assert") version "0.10.0"
 }