diff --git a/.gitmodules b/.gitmodules
index b21152f4ac3..755d45969d4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -5,7 +5,7 @@
 [submodule "external/mono"]
 	path = external/mono
 	url = https://github.com/mono/mono.git
-	branch = 2017-04
+	branch = 2017-06
 [submodule "external/mxe"]
 	path = external/mxe
 	url = https://github.com/xamarin/mxe.git
@@ -39,4 +39,4 @@
 [submodule "xamarin-android-api-compatibility"]
 	path = external/xamarin-android-api-compatibility
 	url = https://github.com/xamarin/xamarin-android-api-compatibility.git
-	branch = d15-4
+	branch = master
diff --git a/Configuration.props b/Configuration.props
index ef23fd5df98..97a03949f09 100644
--- a/Configuration.props
+++ b/Configuration.props
@@ -53,8 +53,8 @@
     <JavaInteropSourceDirectory Condition=" '$(JavaInteropSourceDirectory)' == '' ">$(MSBuildThisFileDirectory)external\Java.Interop</JavaInteropSourceDirectory>
     <LlvmSourceDirectory Condition=" '$(LlvmSourceDirectory)' == '' ">$(MSBuildThisFileDirectory)external\llvm</LlvmSourceDirectory>
     <MonoSourceDirectory>$(MSBuildThisFileDirectory)external\mono</MonoSourceDirectory>
-    <MonoRequiredMinimumVersion Condition=" '$(MonoRequiredMinimumVersion)' == '' ">5.2.0</MonoRequiredMinimumVersion>
-    <MonoRequiredDarwinMinimumVersion>$(MonoRequiredMinimumVersion).114</MonoRequiredDarwinMinimumVersion>
+    <MonoRequiredMinimumVersion Condition=" '$(MonoRequiredMinimumVersion)' == '' ">5.4.0</MonoRequiredMinimumVersion>
+    <MonoRequiredDarwinMinimumVersion>$(MonoRequiredMinimumVersion).147</MonoRequiredDarwinMinimumVersion>
     <LinkerSourceDirectory>$(MSBuildThisFileDirectory)external\linker</LinkerSourceDirectory>
     <OpenTKSourceDirectory>$(MSBuildThisFileDirectory)external\opentk</OpenTKSourceDirectory>
     <LibZipSourceDirectory Condition=" '$(LibZipSourceDirectory)' == '' ">$(MSBuildThisFileDirectory)external\libzip</LibZipSourceDirectory>
diff --git a/build-tools/dependencies/dependencies.projitems b/build-tools/dependencies/dependencies.projitems
index b59fb788231..12566b9f53b 100644
--- a/build-tools/dependencies/dependencies.projitems
+++ b/build-tools/dependencies/dependencies.projitems
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <_DarwinMonoFramework>MonoFramework-MDK-5.2.0.114.macos10.xamarin.universal.pkg</_DarwinMonoFramework>
+    <_DarwinMonoFramework>MonoFramework-MDK-5.4.0.147.macos10.xamarin.universal.pkg</_DarwinMonoFramework>
     <_AptGetInstall>apt-get -f -u install</_AptGetInstall>
   </PropertyGroup>
   <ItemGroup>
@@ -58,7 +58,7 @@
       <MinimumVersion>$(MonoRequiredMinimumVersion)</MinimumVersion>
       <DarwinMinimumVersion>$(MonoRequiredDarwinMinimumVersion)</DarwinMinimumVersion>
       <CurrentVersionCommand>$(MSBuildThisFileDirectory)..\scripts\mono-version</CurrentVersionCommand>
-      <DarwinMinimumUrl>https://bosstoragemirror.blob.core.windows.net/wrench/mono-2017-04/8a/8a4958ae3861143b55981cef3843c328462041f8/$(_DarwinMonoFramework)</DarwinMinimumUrl>
+      <DarwinMinimumUrl>https://bosstoragemirror.blob.core.windows.net/wrench/mono-2017-06/28/28a417c2c0d1a2d1231d8b0a5beea3201208b57d/$(_DarwinMonoFramework)</DarwinMinimumUrl>
       <DarwinInstall>installer -pkg "$(AndroidToolchainCacheDirectory)\$(_DarwinMonoFramework)" -target /</DarwinInstall>
     </RequiredProgram>
   </ItemGroup>
diff --git a/external/linker b/external/linker
index 07b07ef75fa..9fc2a24b5fc 160000
--- a/external/linker
+++ b/external/linker
@@ -1 +1 @@
-Subproject commit 07b07ef75fa1858253af45af6fe30812a5a1655c
+Subproject commit 9fc2a24b5fc389a3bc3bde85efa1e39b43f1fce0
diff --git a/external/llvm b/external/llvm
index dbb6fdffdeb..21492ec92e2 160000
--- a/external/llvm
+++ b/external/llvm
@@ -1 +1 @@
-Subproject commit dbb6fdffdeb780d11851a6be77c209bd7ada4bd3
+Subproject commit 21492ec92e255a43bc6b687468f1eb18a635d94e
diff --git a/external/mono b/external/mono
index 63e8c46ab0f..cb6a2fc7ff0 160000
--- a/external/mono
+++ b/external/mono
@@ -1 +1 @@
-Subproject commit 63e8c46ab0fb0d1744a8f7a855e756c1d69fcf02
+Subproject commit cb6a2fc7ff00b7b8b5f41f08b7a1d60f3cf8d2e6
diff --git a/external/xamarin-android-api-compatibility b/external/xamarin-android-api-compatibility
index 64714d845d3..b26743f1624 160000
--- a/external/xamarin-android-api-compatibility
+++ b/external/xamarin-android-api-compatibility
@@ -1 +1 @@
-Subproject commit 64714d845d3b5dd256b7feb0c0ff1d65f49e652c
+Subproject commit b26743f16240ae3cdab4d40ce8826c0d4cdfff3f