diff --git a/konan/konan.properties b/konan/konan.properties
index 503bacdd67c..931d592f879 100644
--- a/konan/konan.properties
+++ b/konan/konan.properties
@@ -35,10 +35,10 @@ llvmVersion = 6.0.1
 
 # Mac OS X.
 llvmHome.macos_x64 = clang-llvm-6.0.1-darwin-macos
-targetToolchain.macos_x64 = target-toolchain-6-macos_x64
+targetToolchain.macos_x64 = target-toolchain-7-macos_x64
 
 arch.macos_x64 = x86_64
-targetSysRoot.macos_x64 = target-sysroot-6-macos_x64
+targetSysRoot.macos_x64 = target-sysroot-7-macos_x64
 libffiDir.macos_x64 = libffi-3.2.1-2-darwin-macos
 llvmLtoFlags.macos_x64 =
 llvmLtoOptFlags.macos_x64 = -O3 -function-sections
@@ -56,25 +56,25 @@ dependencies.macos_x64 = \
     libffi-3.2.1-2-darwin-macos \
     clang-llvm-6.0.1-darwin-macos
 
-target-sysroot-6-macos_x64.default = \
+target-sysroot-7-macos_x64.default = \
   remote:internal
 
-target-toolchain-6-macos_x64.default = \
+target-toolchain-7-macos_x64.default = \
   remote:internal
 
 # Apple's 32-bit iOS.
-targetToolchain.macos_x64-ios_arm32 = target-toolchain-6-macos_x64
+targetToolchain.macos_x64-ios_arm32 = target-toolchain-7-macos_x64
 dependencies.macos_x64-ios_arm32 = \
   libffi-3.2.1-2-darwin-ios \
   clang-llvm-6.0.1-darwin-macos
 
-target-sysroot-6-ios_arm32.default = \
+target-sysroot-7-ios_arm32.default = \
   remote:internal
 
 arch.ios_arm32 = armv7
 entrySelector.ios_arm32 = -alias _Konan_main _main
 # Shared with 64-bit version.
-targetSysRoot.ios_arm32 = target-sysroot-6-ios_arm64
+targetSysRoot.ios_arm32 = target-sysroot-7-ios_arm64
 libffiDir.ios_arm32 = libffi-3.2.1-2-darwin-ios
 llvmLtoFlags.ios_arm32 =
 llvmLtoOptFlags.ios_arm32 = -O3 -function-sections
@@ -89,17 +89,17 @@ osVersionMinFlagClang.ios_arm32 = -miphoneos-version-min
 osVersionMin.ios_arm32 = 9.0
 
 # Apple's 64-bit iOS.
-targetToolchain.macos_x64-ios_arm64 = target-toolchain-6-macos_x64
+targetToolchain.macos_x64-ios_arm64 = target-toolchain-7-macos_x64
 dependencies.macos_x64-ios_arm64 = \
   libffi-3.2.1-2-darwin-ios \
   clang-llvm-6.0.1-darwin-macos
 
-target-sysroot-6-ios_arm64.default = \
+target-sysroot-7-ios_arm64.default = \
   remote:internal
 
 arch.ios_arm64 = arm64
 entrySelector.ios_arm64 = -alias _Konan_main _main
-targetSysRoot.ios_arm64 = target-sysroot-6-ios_arm64
+targetSysRoot.ios_arm64 = target-sysroot-7-ios_arm64
 libffiDir.ios_arm64 = libffi-3.2.1-2-darwin-ios
 llvmLtoFlags.ios_arm64 =
 llvmLtoOptFlags.ios_arm64 = -O3 -function-sections
@@ -111,20 +111,20 @@ linkerKonanFlags.ios_arm64 = -lc++ -lobjc -framework Foundation -sdk_version 11.
 linkerOptimizationFlags.ios_arm64 = -dead_strip
 osVersionMinFlagLd.ios_arm64 = -iphoneos_version_min
 osVersionMinFlagClang.ios_arm64 = -miphoneos-version-min
-osVersionMin.ios_arm64 = 8.0
+osVersionMin.ios_arm64 = 9.0
 
 #  Apple's iOS simulator.
-targetToolchain.macos_x64-ios_x64 = target-toolchain-6-macos_x64
+targetToolchain.macos_x64-ios_x64 = target-toolchain-7-macos_x64
 dependencies.macos_x64-ios_x64 = \
   libffi-3.2.1-1-darwin-ios_sim \
   clang-llvm-6.0.1-darwin-macos
 
-target-sysroot-6-ios_x64.default = \
+target-sysroot-7-ios_x64.default = \
   remote:internal
 
 arch.ios_x64 = x86_64
 entrySelector.ios_x64 = -alias _Konan_main _main
-targetSysRoot.ios_x64 = target-sysroot-6-ios_x64
+targetSysRoot.ios_x64 = target-sysroot-7-ios_x64
 libffiDir.ios_x64 = libffi-3.2.1-1-darwin-ios_sim
 llvmLtoFlags.ios_x64 =
 llvmLtoOptFlags.ios_x64 = -O3 -function-sections
@@ -136,7 +136,7 @@ linkerNoDebugFlags.ios_x64 = -S
 linkerDynamicFlags.ios_x64 = -dylib
 osVersionMinFlagLd.ios_x64 = -ios_simulator_version_min
 osVersionMinFlagClang.ios_x64 = -mios-simulator-version-min
-osVersionMin.ios_x64 = 8.0
+osVersionMin.ios_x64 = 9.0
 
 # Linux x86-64.
 llvmHome.linux_x64 = clang-llvm-6.0.1-linux-x86-64
diff --git a/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt b/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt
index a75eb2a3a55..d1c1ac57927 100644
--- a/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt
+++ b/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt
@@ -59,10 +59,10 @@ class ClangArgs(private val configurables: Configurables) : Configurables by con
                     listOf("-stdlib=libc++", "-arch", "armv7", "-isysroot", absoluteTargetSysRoot, "-miphoneos-version-min=9.0.0")
 
                 KonanTarget.IOS_ARM64 ->
-                    listOf("-stdlib=libc++", "-arch", "arm64", "-isysroot", absoluteTargetSysRoot, "-miphoneos-version-min=8.0.0")
+                    listOf("-stdlib=libc++", "-arch", "arm64", "-isysroot", absoluteTargetSysRoot, "-miphoneos-version-min=9.0.0")
 
                 KonanTarget.IOS_X64 ->
-                    listOf("-stdlib=libc++", "-isysroot", absoluteTargetSysRoot, "-miphoneos-version-min=8.0.0")
+                    listOf("-stdlib=libc++", "-isysroot", absoluteTargetSysRoot, "-miphoneos-version-min=9.0.0")
 
                 KonanTarget.ANDROID_ARM32 ->
                     listOf("-target", targetArg!!,
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 3cb5cd6261a..9fe3cc4211d 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
@@ -69,7 +69,7 @@ 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", "9.4.1")
+    this.setProperty("useFixedXcodeVersion", "10.0")
     // 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
index 0304db7fdf1..f93c86fa7f1 100755
--- a/tools/scripts/update_xcode.sh
+++ b/tools/scripts/update_xcode.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-KONAN_TOOLCHAIN_VERSION=6
+KONAN_TOOLCHAIN_VERSION=7
 SDKS="macosx iphoneos iphonesimulator watchos watchsimulator"
 TARBALL_macosx=target-sysroot-$KONAN_TOOLCHAIN_VERSION-macos_x64
 TARBALL_iphoneos=target-sysroot-$KONAN_TOOLCHAIN_VERSION-ios_arm64