diff --git a/README.md b/README.md
index bcea5c3aeaa..c9c639df22e 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ without the need to ship an additional execution runtime.
 
 Prerequisites:
 *   install JDK for your platform, instead of JRE. The build requires ```tools.jar```, which is not included in JRE;
-*   on macOS install Xcode 11 (Xcode 11.4 is required to compile Kotlin/Native from sources)
+*   on macOS install Xcode 11 (Xcode 11.5 is required to compile Kotlin/Native from sources)
 *   on Fedora 26+ ```yum install ncurses-compat-libs``` may be needed
 *   on recent Ubuntu ```apt install libncurses5``` is needed
 
diff --git a/konan/konan.properties b/konan/konan.properties
index c3c965954a8..75bae991d0f 100644
--- a/konan/konan.properties
+++ b/konan/konan.properties
@@ -43,12 +43,12 @@ llvmVersion.macos_x64 = 8.0.0
 
 # Mac OS X.
 llvmHome.macos_x64 = clang-llvm-apple-8.0.0-darwin-macos
-targetToolchain.macos_x64 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64 = target-toolchain-xcode_11_5-macos_x64
 libffiDir.macos_x64 = libffi-3.2.1-3-darwin-macos
-additionalToolsDir.macos_x64 = xcode-addon-xcode_11_4-macos_x64
+additionalToolsDir.macos_x64 = xcode-addon-xcode_11_5-macos_x64
 
 arch.macos_x64 = x86_64
-targetSysRoot.macos_x64 = target-sysroot-xcode_11_4-macos_x64
+targetSysRoot.macos_x64 = target-sysroot-xcode_11_5-macos_x64
 
 clangFlags.macos_x64 = -cc1 -emit-obj -disable-llvm-passes -x ir
 clangNooptFlags.macos_x64 = -O1
@@ -69,28 +69,28 @@ dependencies.macos_x64 = \
     lldb-2-macos \
     clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-macos_x64.default = \
+target-sysroot-xcode_11_5-macos_x64.default = \
   remote:internal
 
-target-toolchain-xcode_11_4-macos_x64.default = \
+target-toolchain-xcode_11_5-macos_x64.default = \
   remote:internal
 
-xcode-addon-xcode_11_4-macos_x64.default = \
+xcode-addon-xcode_11_5-macos_x64.default = \
   remote:internal
 
 
 # Apple's 32-bit iOS.
-targetToolchain.macos_x64-ios_arm32 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-ios_arm32 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-ios_arm32 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-ios_arm32.default = \
+target-sysroot-xcode_11_5-ios_arm32.default = \
   remote:internal
 
 arch.ios_arm32 = armv7
 # Shared with 64-bit version.
-targetSysRoot.ios_arm32 = target-sysroot-xcode_11_4-ios_arm64
+targetSysRoot.ios_arm32 = target-sysroot-xcode_11_5-ios_arm64
 
 clangFlags.ios_arm32 = -cc1 -emit-obj -disable-llvm-optzns -x ir
 clangNooptFlags.ios_arm32 = -O1
@@ -99,23 +99,23 @@ clangDebugFlags.ios_arm32 = -O0
 clangDynamicFlags.ios_arm32 =
 linkerNoDebugFlags.ios_arm32 = -S
 linkerDynamicFlags.ios_arm32 = -dylib
-linkerKonanFlags.ios_arm32 = -lSystem -lc++ -lobjc -framework Foundation -sdk_version 13.4
+linkerKonanFlags.ios_arm32 = -lSystem -lc++ -lobjc -framework Foundation -sdk_version 13.5
 linkerOptimizationFlags.ios_arm32 = -dead_strip
 osVersionMinFlagLd.ios_arm32 = -iphoneos_version_min
 osVersionMinFlagClang.ios_arm32 = -miphoneos-version-min
 osVersionMin.ios_arm32 = 9.0
 
 # Apple's 64-bit iOS.
-targetToolchain.macos_x64-ios_arm64 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-ios_arm64 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-ios_arm64 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-ios_arm64.default = \
+target-sysroot-xcode_11_5-ios_arm64.default = \
   remote:internal
 
 arch.ios_arm64 = arm64
-targetSysRoot.ios_arm64 = target-sysroot-xcode_11_4-ios_arm64
+targetSysRoot.ios_arm64 = target-sysroot-xcode_11_5-ios_arm64
 
 clangFlags.ios_arm64 = -cc1 -emit-obj -disable-llvm-passes -x ir
 clangNooptFlags.ios_arm64 = -O1
@@ -128,23 +128,23 @@ clangDynamicFlags.ios_arm64 =
 
 linkerNoDebugFlags.ios_arm64 = -S
 linkerDynamicFlags.ios_arm64 = -dylib
-linkerKonanFlags.ios_arm64 = -lSystem -lc++ -lobjc -framework Foundation -sdk_version 13.4
+linkerKonanFlags.ios_arm64 = -lSystem -lc++ -lobjc -framework Foundation -sdk_version 13.5
 linkerOptimizationFlags.ios_arm64 = -dead_strip
 osVersionMinFlagLd.ios_arm64 = -iphoneos_version_min
 osVersionMinFlagClang.ios_arm64 = -miphoneos-version-min
 osVersionMin.ios_arm64 = 9.0
 
 #  Apple's iOS simulator.
-targetToolchain.macos_x64-ios_x64 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-ios_x64 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-ios_x64 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-ios_x64.default = \
+target-sysroot-xcode_11_5-ios_x64.default = \
   remote:internal
 
 arch.ios_x64 = x86_64
-targetSysRoot.ios_x64 = target-sysroot-xcode_11_4-ios_x64
+targetSysRoot.ios_x64 = target-sysroot-xcode_11_5-ios_x64
 
 clangFlags.ios_x64 = -cc1 -emit-obj -disable-llvm-passes -x ir
 clangNooptFlags.ios_x64 = -O1
@@ -152,7 +152,7 @@ clangOptFlags.ios_x64 = -O3
 clangDebugFlags.ios_x64 = -O0
 clangDynamicFlags.ios_x64 =
 
-linkerKonanFlags.ios_x64 = -lSystem -lc++ -lobjc -framework Foundation -sdk_version 13.4
+linkerKonanFlags.ios_x64 = -lSystem -lc++ -lobjc -framework Foundation -sdk_version 13.5
 linkerOptimizationFlags.ios_x64 = -dead_strip
 linkerNoDebugFlags.ios_x64 = -S
 linkerDynamicFlags.ios_x64 = -dylib
@@ -161,16 +161,16 @@ osVersionMinFlagClang.ios_x64 = -mios-simulator-version-min
 osVersionMin.ios_x64 = 9.0
 
 #  Apple's tvOS simulator.
-targetToolchain.macos_x64-tvos_x64 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-tvos_x64 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-tvos_x64 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-tvos_x64.default = \
+target-sysroot-xcode_11_5-tvos_x64.default = \
   remote:internal
 
 arch.tvos_x64 = x86_64
-targetSysRoot.tvos_x64 = target-sysroot-xcode_11_4-tvos_x64
+targetSysRoot.tvos_x64 = target-sysroot-xcode_11_5-tvos_x64
 
 clangFlags.tvos_x64 = -cc1 -emit-obj -disable-llvm-passes -x ir
 clangNooptFlags.tvos_x64 = -O1
@@ -187,16 +187,16 @@ osVersionMinFlagClang.tvos_x64 = -mtvos-simulator-version-min
 osVersionMin.tvos_x64 = 9.0
 
 # Apple's 64-bit tvOS.
-targetToolchain.macos_x64-tvos_arm64 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-tvos_arm64 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-tvos_arm64 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-tvos_arm64.default = \
+target-sysroot-xcode_11_5-tvos_arm64.default = \
   remote:internal
 
 arch.tvos_arm64 = arm64
-targetSysRoot.tvos_arm64 = target-sysroot-xcode_11_4-tvos_arm64
+targetSysRoot.tvos_arm64 = target-sysroot-xcode_11_5-tvos_arm64
 
 clangFlags.tvos_arm64 = -cc1 -emit-obj -disable-llvm-passes -x ir
 clangNooptFlags.tvos_arm64 = -O1
@@ -213,16 +213,16 @@ osVersionMinFlagClang.tvos_arm64 = -mtvos-version-min
 osVersionMin.tvos_arm64 = 9.0
 
 # watchOS armv7k
-targetToolchain.macos_x64-watchos_arm32 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-watchos_arm32 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-watchos_arm32 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-watchos_arm32.default = \
+target-sysroot-xcode_11_5-watchos_arm32.default = \
   remote:internal
 
 arch.watchos_arm32 = armv7k
-targetSysRoot.watchos_arm32 = target-sysroot-xcode_11_4-watchos_arm32
+targetSysRoot.watchos_arm32 = target-sysroot-xcode_11_5-watchos_arm32
 
 clangFlags.watchos_arm32 = -cc1 -emit-obj -disable-llvm-passes -x ir
 clangNooptFlags.watchos_arm32 = -O1
@@ -239,16 +239,16 @@ osVersionMinFlagClang.watchos_arm32 = -mwatchos-version-min
 osVersionMin.watchos_arm32 = 5.0
 
 # watchOS arm64_32
-targetToolchain.macos_x64-watchos_arm64 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-watchos_arm64 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-watchos_arm64 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-watchos_arm64.default = \
+target-sysroot-xcode_11_5-watchos_arm64.default = \
   remote:internal
 
 arch.watchos_arm64 = arm64_32
-targetSysRoot.watchos_arm64 = target-sysroot-xcode_11_4-watchos_arm32
+targetSysRoot.watchos_arm64 = target-sysroot-xcode_11_5-watchos_arm32
 
 clangFlags.watchos_arm64 = -cc1 -emit-obj -disable-llvm-passes -x ir -mllvm -aarch64-watch-bitcode-compatibility \
   -mllvm -arm-bitcode-compatibility -mllvm -fast-isel=false -mllvm -global-isel=false
@@ -266,16 +266,16 @@ osVersionMinFlagClang.watchos_arm64 = -mwatchos-version-min
 osVersionMin.watchos_arm64 = 5.0
 
 #  Apple's watchOS i386 simulator.
-targetToolchain.macos_x64-watchos_x86 = target-toolchain-xcode_11_4-macos_x64
+targetToolchain.macos_x64-watchos_x86 = target-toolchain-xcode_11_5-macos_x64
 dependencies.macos_x64-watchos_x86 = \
   libffi-3.2.1-3-darwin-macos \
   clang-llvm-apple-8.0.0-darwin-macos
 
-target-sysroot-xcode_11_4-watchos_x86.default = \
+target-sysroot-xcode_11_5-watchos_x86.default = \
   remote:internal
 
 arch.watchos_x86 = i386
-targetSysRoot.watchos_x86 = target-sysroot-xcode_11_4-watchos_x86
+targetSysRoot.watchos_x86 = target-sysroot-xcode_11_5-watchos_x86
 
 # -target-cpu pentium4 makes sure that cogenerator knows which CPU flavour to emit code for.
 # Can be seen on optimized build and FP tests, where value is passed on stack
diff --git a/tools/scripts/update_xcode.sh b/tools/scripts/update_xcode.sh
index 16bc175af16..141d88352a3 100755
--- a/tools/scripts/update_xcode.sh
+++ b/tools/scripts/update_xcode.sh
@@ -2,7 +2,7 @@
 set -e
 
 # "brew install coreutils" for grealpath.
-KONAN_TOOLCHAIN_VERSION=xcode_11_4
+KONAN_TOOLCHAIN_VERSION=xcode_11_5
 SDKS="macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator"
 TARBALL_macosx=target-sysroot-$KONAN_TOOLCHAIN_VERSION-macos_x64
 TARBALL_iphoneos=target-sysroot-$KONAN_TOOLCHAIN_VERSION-ios_arm64