diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000000..03e22d69f1b
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{kt,kts}]
+indent_style = space
+indent_size = 2
diff --git a/README.md b/README.md
index 6aff87cb6e5..43dc48ecbb9 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ Builds of the Gradle plugin are available through the
 
 ```kotlin
 plugins {
-  kotlin("jvm") version "1.4.0"
+  kotlin("jvm") version "1.4.20"
   id("com.bnorm.power.kotlin-power-assert") version "0.5.3"
 }
 ```
@@ -94,7 +94,7 @@ configure<com.bnorm.power.PowerAssertGradleExtension> {
 ## Kotlin IR
 
 Using this compiler plugin only works if the code is compiled using Kotlin
-1.4.0 and IR is enabled. This includes all IR based compiler backends: JVM, JS,
+1.4.20 and IR is enabled. This includes all IR based compiler backends: JVM, JS,
 and Native! As Kotlin IR is still experimental, mileage may vary.
 
 ##### Kotlin/JVM
diff --git a/build.gradle.kts b/build.gradle.kts
index 7d45bbc7d83..cedc954ae92 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-  kotlin("jvm") version "1.4.0" apply false
+  kotlin("jvm") version "1.4.20" 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/src/main/kotlin/com/bnorm/power/IrStackVariable.kt b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/IrStackVariable.kt
index 6ef3aa0c5dc..faa5b9abb5a 100644
--- a/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/IrStackVariable.kt
+++ b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/IrStackVariable.kt
@@ -16,6 +16,7 @@
 
 package com.bnorm.power
 
+import org.jetbrains.kotlin.backend.common.ir.isSuspend
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.builders.IrBuilderWithScope
@@ -23,10 +24,13 @@ import org.jetbrains.kotlin.ir.builders.irConcat
 import org.jetbrains.kotlin.ir.builders.irGet
 import org.jetbrains.kotlin.ir.builders.irString
 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.expressions.IrExpression
+import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
 import org.jetbrains.kotlin.ir.expressions.IrMemberAccessExpression
 import org.jetbrains.kotlin.ir.expressions.IrStatementOrigin
+import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 
 data class IrStackVariable(
   val temporary: IrVariable,
@@ -62,11 +66,10 @@ fun IrBuilderWithScope.buildMessage(
     var row = info.startLineNumber - originalInfo.startLineNumber
 
     val columnOffset: Int = when (original) {
-      is IrMemberAccessExpression -> {
-        // TODO IrFunction doesn't have 'isInfix' as a property
-        val descriptor = original.symbol.descriptor
+      is IrMemberAccessExpression<*> -> {
+        val owner = original.symbol.owner
         when {
-          descriptor is FunctionDescriptor && descriptor.isInfix -> source.indexOf(descriptor.name.asString())
+          owner is IrSimpleFunction && owner.isInfix -> source.indexOf(owner.name.asString())
           else -> when (original.origin) {
             // TODO handle equality and comparison better?
             IrStatementOrigin.EQEQ, IrStatementOrigin.EQEQEQ -> source.indexOf("==")
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 14bd6fd876d..54d3134a460 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
@@ -24,7 +24,6 @@ import org.jetbrains.kotlin.backend.common.ir.inline
 import org.jetbrains.kotlin.backend.common.lower.DeclarationIrBuilder
 import org.jetbrains.kotlin.backend.common.lower.at
 import org.jetbrains.kotlin.cli.common.messages.*
-import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.builders.IrBuilderWithScope
 import org.jetbrains.kotlin.ir.builders.declarations.buildFun
@@ -48,9 +47,9 @@ import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.util.OperatorNameConventions
 import java.io.File
+import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 
 fun FileLoweringPass.runOnFileInOrder(irFile: IrFile) {
   irFile.acceptVoid(object : IrElementVisitorVoid {
@@ -81,8 +80,7 @@ class PowerAssertCallTransformer(
   }
 
   override fun visitCall(expression: IrCall): IrExpression {
-    // TODO expression.symbol.owner.fqNameSafe includes the wrapping ClassKt while descriptor doesn't
-    val fqName = expression.symbol.descriptor.fqNameSafe
+    val fqName = expression.symbol.owner.kotlinFqName
     if (functions.none { fqName == it })
       return super.visitCall(expression)
 
@@ -179,10 +177,10 @@ class PowerAssertCallTransformer(
             object : FunctionDelegate {
               override fun buildCall(builder: IrBuilderWithScope, original: IrCall, message: IrExpression): IrExpression = with(builder) {
                 val scope = this
-                val lambda = buildFun {
+                val lambda = builder.context.irFactory.buildFun {
                   name = Name.special("<anonymous>")
                   returnType = context.irBuiltIns.stringType
-                  visibility = Visibilities.LOCAL
+                  visibility = DescriptorVisibilities.LOCAL
                   origin = IrDeclarationOrigin.LOCAL_FUNCTION_FOR_LAMBDA
                 }.apply {
                   val bodyBuilder = DeclarationIrBuilder(this@PowerAssertCallTransformer.context, symbol)
diff --git a/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/internal/ReturnableBlockTransformer.kt b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/internal/ReturnableBlockTransformer.kt
index 13f85e47e20..f5df2377e6e 100644
--- a/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/internal/ReturnableBlockTransformer.kt
+++ b/kotlin-power-assert-plugin/src/main/kotlin/com/bnorm/power/internal/ReturnableBlockTransformer.kt
@@ -2,7 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  *
- * Copied from https://github.com/JetBrains/kotlin/blob/1.4.0/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/ReturnableBlockLowering.kt
+ * Copied from https://github.com/JetBrains/kotlin/blob/1.4.20/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/ReturnableBlockLowering.kt
  */
 
 package com.bnorm.power.internal
@@ -15,6 +15,7 @@ import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.expressions.impl.*
 import org.jetbrains.kotlin.ir.symbols.IrReturnableBlockSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
+import org.jetbrains.kotlin.ir.transformStatement
 
 // TODO Remove when inlining works correctly on Kotlin/JS and Kotlin/Native
 class ReturnableBlockTransformer(val context: IrGeneratorContext, val containerSymbol: IrSymbol? = null) : IrElementTransformerVoidWithContext() {
@@ -52,7 +53,7 @@ class ReturnableBlockTransformer(val context: IrGeneratorContext, val containerS
     returnMap[expression.symbol] = { returnExpression ->
       hasReturned = true
       builder.irComposite(returnExpression) {
-        +irSetVar(variable.symbol, returnExpression.value)
+        +irSet(variable.symbol, returnExpression.value)
         +irBreak(loop)
       }
     }
@@ -61,10 +62,10 @@ class ReturnableBlockTransformer(val context: IrGeneratorContext, val containerS
       if (i == expression.statements.lastIndex && s is IrReturn && s.returnTargetSymbol == expression.symbol) {
         s.transformChildrenVoid()
         if (!hasReturned) s.value else {
-          builder.irSetVar(variable.symbol, s.value)
+          builder.irSet(variable.symbol, s.value)
         }
       } else {
-        s.transform(this, null)
+        s.transformStatement(this)
       }
     }
 
diff --git a/sample/build.gradle.kts b/sample/build.gradle.kts
index 6eea9635b6a..a3c4713b169 100644
--- a/sample/build.gradle.kts
+++ b/sample/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-  kotlin("multiplatform") version "1.4.0"
+  kotlin("multiplatform") version "1.4.20"
   id("com.bnorm.power.kotlin-power-assert") version "0.5.3"
 }