diff --git a/build-tools/build.gradle.kts b/build-tools/build.gradle.kts
index ee86e29df97..17595da1afc 100644
--- a/build-tools/build.gradle.kts
+++ b/build-tools/build.gradle.kts
@@ -44,7 +44,7 @@ dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion")
     implementation("org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion")
     implementation("com.ullink.slack:simpleslackapi:1.2.0")
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime:0.10.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime:0.14.0")
 
     implementation("io.ktor:ktor-client-auth:1.2.1")
     implementation("io.ktor:ktor-client-core:1.2.1")
diff --git a/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExecutorService.kt b/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExecutorService.kt
index ea441eb0025..b4d9682e6b0 100644
--- a/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExecutorService.kt
+++ b/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExecutorService.kt
@@ -17,8 +17,8 @@
 package org.jetbrains.kotlin
 
 import groovy.lang.Closure
-import kotlinx.serialization.Serializable
-import kotlinx.serialization.json.Json
+import kotlinx.serialization.*
+import kotlinx.serialization.json.*
 import org.gradle.api.Action
 import org.gradle.api.Project
 import org.gradle.process.ExecResult
@@ -420,11 +420,11 @@ private fun deviceLauncher(project: Project) = object : ExecutorService {
         }
         return out.toString().run {
             check(isNotEmpty())
-            @Serializable
+            @kotlinx.serialization.Serializable
             data class DeviceTarget(val name: String, val udid: String, val state: String, val type: String)
             split("\n")
                     .filter { it.isNotEmpty() }
-                    .map { Json(strictMode = false).parse(DeviceTarget.serializer(), it) }
+                    .map { Json(JsonConfiguration.Default).parse(DeviceTarget.serializer(), it) }
                     .first {
                         it.type == "device" && deviceName?.run { this == it.name } ?: true
                     }
diff --git a/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExternalReportUtils.kt b/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExternalReportUtils.kt
index 58b30ad8230..ee426c8f3e0 100644
--- a/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExternalReportUtils.kt
+++ b/build-tools/src/main/kotlin/org/jetbrains/kotlin/ExternalReportUtils.kt
@@ -2,12 +2,12 @@ package org.jetbrains.kotlin
 
 import kotlinx.io.PrintWriter
 import kotlinx.serialization.*
-import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.*
 import java.io.File
 import java.io.FileReader
 
 
-@Serializable
+@kotlinx.serialization.Serializable
 data class ExternalTestReport(val statistics: Statistics, val groups: List<KonanTestGroupReport>)
 
 @ImplicitReflectionSerializer
diff --git a/build-tools/src/main/kotlin/org/jetbrains/kotlin/KonanTestSuiteReport.kt b/build-tools/src/main/kotlin/org/jetbrains/kotlin/KonanTestSuiteReport.kt
index 4e8bc1ea9e1..da2412caa2c 100644
--- a/build-tools/src/main/kotlin/org/jetbrains/kotlin/KonanTestSuiteReport.kt
+++ b/build-tools/src/main/kotlin/org/jetbrains/kotlin/KonanTestSuiteReport.kt
@@ -13,7 +13,7 @@ enum class TestStatus {
     SKIPPED
 }
 
-@Serializable
+@kotlinx.serialization.Serializable
 data class Statistics(
         var passed: Int = 0,
         var failed: Int = 0,
@@ -42,13 +42,13 @@ val Statistics.total: Int
 
 class TestFailedException(msg:String) : RuntimeException(msg)
 
-@Serializable
+@kotlinx.serialization.Serializable
 data class KonanTestGroupReport(val name:String, val suites:List<KonanTestSuiteReport>)
 
-@Serializable
+@kotlinx.serialization.Serializable
 data class KonanTestSuiteReport(val name: String, val tests: List<KonanTestCaseReport>)
 
-@Serializable
+@kotlinx.serialization.Serializable
 data class KonanTestCaseReport(val name:String, val status: TestStatus, @Optional val comment:String? = null)
 
 class KonanTestSuiteReportEnvironment(val name:String, val project: Project, val statistics: Statistics) {