diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt
index 41d5527d15d..8aed75315fb 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/ir/util/IrUtils2.kt
@@ -395,8 +395,6 @@ fun IrValueParameter.copy(newDescriptor: ParameterDescriptor): IrValueParameter
     )
 }
 
-val IrTypeArgument.typeOrNull: IrType? get() = (this as? IrTypeProjection)?.type
-
 val IrType.isSimpleTypeWithQuestionMark: Boolean
     get() = this is IrSimpleType && this.hasQuestionMark
 
diff --git a/gradle.properties b/gradle.properties
index 9fe2ce0b52b..ba7903f71db 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -18,12 +18,12 @@
 buildKotlinVersion=1.3.70-dev-1070
 buildKotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_KotlinPublic_Compiler),number:1.3.70-dev-1070,branch:default:any,pinned:true/artifacts/content/maven
 remoteRoot=konan_tests
-kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_KotlinPublic_Compiler),number:1.4.0-dev-216,branch:default:any,pinned:true/artifacts/content/maven
-kotlinVersion=1.4.0-dev-216
-kotlinStdlibRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_KotlinPublic_Compiler),number:1.3.70-dev-2841,branch:default:any,pinned:true/artifacts/content/maven
-kotlinStdlibVersion=1.4.0-dev-216
-kotlinStdlibTestsVersion=1.4.0-dev-216
-testKotlinCompilerVersion=1.4.0-dev-216
+kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_KotlinPublic_Compiler),number:1.4.0-dev-445,branch:default:any,pinned:true/artifacts/content/maven
+kotlinVersion=1.4.0-dev-445
+kotlinStdlibRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_KotlinPublic_Compiler),number:1.4.0-dev-445,branch:default:any,pinned:true/artifacts/content/maven
+kotlinStdlibVersion=1.4.0-dev-445
+kotlinStdlibTestsVersion=1.4.0-dev-445
+testKotlinCompilerVersion=1.4.0-dev-445
 konanVersion=1.4.0
 
 # A version of Xcode required to build the Kotlin/Native compiler.