diff --git a/konan/konan.properties b/konan/konan.properties
index 715fd832596..d392eb27867 100644
--- a/konan/konan.properties
+++ b/konan/konan.properties
@@ -33,10 +33,10 @@ llvmVersion = 5.0.0
 
 # Mac OS X.
 llvmHome.macos_x64 = clang-llvm-5.0.0-darwin-macos
-targetToolchain.macos_x64 = target-toolchain-1-osx
+targetToolchain.macos_x64 = target-toolchain-4-macos_x64
 
 arch.macos_x64 = x86_64
-targetSysRoot.macos_x64 = target-sysroot-2-darwin-macos
+targetSysRoot.macos_x64 = target-sysroot-4-macos_x64
 libffiDir.macos_x64 = libffi-3.2.1-2-darwin-macos
 llvmLtoFlags.macos_x64 =
 llvmLtoOptFlags.macos_x64 = -O3 -function-sections
@@ -54,24 +54,24 @@ dependencies.macos_x64 = \
     libffi-3.2.1-2-darwin-macos \
     clang-llvm-5.0.0-darwin-macos
 
-target-sysroot-2-darwin-macos.default = \
+target-sysroot-4-macos_x64.default = \
   remote:internal
 
-target-toolchain-1-osx.default = \
+target-toolchain-4-macos_x64.default = \
   remote:internal
 
 # Apple iOS.
-targetToolchain.macos_x64-ios_arm64 = target-toolchain-1-osx
+targetToolchain.macos_x64-ios_arm64 = target-toolchain-4-macos_x64
 dependencies.macos_x64-ios_arm64 = \
   libffi-3.2.1-2-darwin-ios \
   clang-llvm-5.0.0-darwin-macos
 
-target-sysroot-3-darwin-ios.default = \
+target-sysroot-4-ios_arm64.default = \
   remote:internal
 
 arch.ios_arm64 = arm64
 entrySelector.ios_arm64 = -alias _Konan_main _main
-targetSysRoot.ios_arm64 = target-sysroot-3-darwin-ios
+targetSysRoot.ios_arm64 = target-sysroot-4-ios_arm64
 libffiDir.ios_arm64 = libffi-3.2.1-2-darwin-ios
 llvmLtoFlags.ios_arm64 =
 llvmLtoOptFlags.ios_arm64 = -O3 -function-sections
@@ -86,17 +86,17 @@ osVersionMinFlagClang.ios_arm64 = -miphoneos-version-min
 osVersionMin.ios_arm64 = 8.0
 
 #  Apple iOS simulator.
-targetToolchain.macos_x64-ios_x64 = target-toolchain-1-osx
+targetToolchain.macos_x64-ios_x64 = target-toolchain-4-macos_x64
 dependencies.macos_x64-ios_x64 = \
   libffi-3.2.1-1-darwin-ios_sim \
   clang-llvm-5.0.0-darwin-macos
 
-target-sysroot-2-darwin-ios_sim.default = \
+target-sysroot-4-ios_x64.default = \
   remote:internal
 
 arch.ios_x64 = x86_64
 entrySelector.ios_x64 = -alias _Konan_main _main
-targetSysRoot.ios_x64 = target-sysroot-2-darwin-ios_sim
+targetSysRoot.ios_x64 = target-sysroot-4-ios_x64
 libffiDir.ios_x64 = libffi-3.2.1-1-darwin-ios_sim
 llvmLtoFlags.ios_x64 =
 llvmLtoOptFlags.ios_x64 = -O3 -function-sections
diff --git a/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/KonanProperties.kt b/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/KonanProperties.kt
index f0ae8cdf76a..7023d8a1025 100644
--- a/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/KonanProperties.kt
+++ b/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/KonanProperties.kt
@@ -40,7 +40,7 @@ abstract class KonanPropertiesLoader(override val target: KonanTarget, val prope
 
     override fun targetString(key: String): String? 
         = properties.targetString(key, target)
-    override fun targetList(key: String): List<String> 
+    override fun targetList(key: String): List<String>
         = properties.targetList(key, target)
     override fun hostString(key: String): String? 
         = properties.hostString(key)
@@ -67,7 +67,7 @@ fun Properties.keepOnlyDefaultProfiles() {
     // Force build to use only 'default' profile:
     this.setProperty(DEPENDENCY_PROFILES_KEY, "default")
     // Force build to use fixed Xcode version:
-    this.setProperty("useFixedXcodeVersion", "9.2")
+    this.setProperty("useFixedXcodeVersion", "9.3")
     // TODO: it actually affects only resolution made in :dependencies,
     // that's why we assume that 'default' profile comes first (and check this above).
 }
diff --git a/tools/scripts/update_xcode.sh b/tools/scripts/update_xcode.sh
new file mode 100755
index 00000000000..aec5cb3b92b
--- /dev/null
+++ b/tools/scripts/update_xcode.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+KONAN_TOOLCHAIN_VERSION=4
+SDKS="macosx iphoneos iphonesimulator"
+TARBALL_macosx=target-sysroot-$KONAN_TOOLCHAIN_VERSION-macos_x64
+TARBALL_iphoneos=target-sysroot-$KONAN_TOOLCHAIN_VERSION-ios_arm64
+TARBALL_iphonesimulator=target-sysroot-$KONAN_TOOLCHAIN_VERSION-ios_x64
+TARBALL_xcode=target-toolchain-$KONAN_TOOLCHAIN_VERSION-macos_x64
+OUT=`pwd`
+
+for s in $SDKS; do
+  p=`xcrun --sdk $s --show-sdk-path`
+  p=`grealpath $p`
+  tarball_var=TARBALL_${s}
+  tarball=${!tarball_var}
+  echo "Packing SDK $s as $OUT/$tarball.tar.gz..."
+  $SHELL -c "tar czf $OUT/$tarball.tar.gz -C $p -s '/^\./$tarball/'  ."
+done
+
+t=`xcrun -f ld`
+t=`dirname $t`
+t=`grealpath $t/../..`
+tarball=$TARBALL_xcode
+echo "Packing toolchain $OUT/$tarball.tar.gz..."
+$SHELL -c "tar czf $OUT/$tarball.tar.gz -C $t -s '/^\./$tarball/'  ."
\ No newline at end of file