diff --git a/backend.native/build.gradle b/backend.native/build.gradle
index 5851fdb9705..df39112d196 100644
--- a/backend.native/build.gradle
+++ b/backend.native/build.gradle
@@ -51,6 +51,7 @@ compileCompilerKotlin {
     // The protobuf plugin specifies this dependency for java by itself,
     // but not for Kotlin.
     dependsOn('generateCompilerProto')
+    kotlinOptions.jvmTarget = "1.8"
 }
 
 compileCompilerJava {
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLower.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLower.kt
index b0a6c157691..07187763752 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLower.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLower.kt
@@ -109,7 +109,7 @@ internal class KonanLower(val context: Context, val parentPhaser: PhaseManager)
         }
         phaser.phase(KonanPhase.LOWER_DEFAULT_PARAMETER_EXTENT) {
             DefaultArgumentStubGenerator(context, skipInlineMethods = false).runOnFilePostfix(irFile)
-            KonanDefaultParameterInjector(context).runOnFilePostfix(irFile)
+            KonanDefaultParameterInjector(context).lower(irFile)
         }
         phaser.phase(KonanPhase.LOWER_BUILTIN_OPERATORS) {
             BuiltinOperatorLowering(context).lower(irFile)
diff --git a/gradle.properties b/gradle.properties
index 4b1ce11a2af..048af6c6667 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -15,12 +15,12 @@
 #
 
 # A version of the Kotlin "toolchain" (compiler, runtime, stdlib etc) used by the build script.
-buildKotlinVersion=1.3.20
-buildKotlinCompilerRepo=https://cache-redirector.jetbrains.com/maven-central
+buildKotlinVersion=1.3.30-dev-1297
+buildKotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_CompilerAllPlugins),number:1.3.30-dev-1297,pinned:true/artifacts/content/maven
 remoteRoot=konan_tests
-kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_CompilerAllPlugins),number:1.3.30-dev-1296,pinned:true/artifacts/content/maven
-kotlinVersion=1.3.30-dev-1296
-testKotlinVersion=1.3.30-dev-1296
+kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_dev_CompilerAllPlugins),number:1.3.30-dev-1419,branch:default:true,pinned:true/artifacts/content/maven
+kotlinVersion=1.3.30-dev-1419
+testKotlinVersion=1.3.30-dev-1419
 konanVersion=1.2.0
 org.gradle.jvmargs='-Dfile.encoding=UTF-8'
 org.gradle.workers.max=4