diff --git a/external/Xamarin.MacDev b/external/Xamarin.MacDev
index ca221c8fd65a..0f578f51e63b 160000
--- a/external/Xamarin.MacDev
+++ b/external/Xamarin.MacDev
@@ -1 +1 @@
-Subproject commit ca221c8fd65a6f1d6e85d77018d4a7619a2c120d
+Subproject commit 0f578f51e63b6ff93014782dbc9378e6b6bc6d75
diff --git a/msbuild/Xamarin.Mac.Tasks.Core/MacOSXSdks.cs b/msbuild/Xamarin.Mac.Tasks.Core/MacOSXSdks.cs
index 006da4b5873a..c0c10b1ad04c 100644
--- a/msbuild/Xamarin.Mac.Tasks.Core/MacOSXSdks.cs
+++ b/msbuild/Xamarin.Mac.Tasks.Core/MacOSXSdks.cs
@@ -14,15 +14,10 @@ static MacOSXSdks ()
 		{
 			Native = new MacOSXSdk (AppleSdkSettings.DeveloperRoot, AppleSdkSettings.DeveloperRootVersionPlist);
 			XamMac = new XamMacSdk (null);
-
-			AppleSdkSettings.Changed += delegate {
-				Native = new MacOSXSdk (AppleSdkSettings.DeveloperRoot, AppleSdkSettings.DeveloperRootVersionPlist);
-			};
 		}
 
 		public static void CheckInfoCaches ()
 		{
-			AppleSdkSettings.CheckChanged ();
 			XamMac.CheckCaches ();
 		}
 	}
diff --git a/msbuild/Xamarin.iOS.Tasks.Core/IPhoneSdks.cs b/msbuild/Xamarin.iOS.Tasks.Core/IPhoneSdks.cs
index 1fdfea9d61b1..7dcdff8b4b8c 100644
--- a/msbuild/Xamarin.iOS.Tasks.Core/IPhoneSdks.cs
+++ b/msbuild/Xamarin.iOS.Tasks.Core/IPhoneSdks.cs
@@ -18,17 +18,10 @@ public static class IPhoneSdks
 		static IPhoneSdks ()
 		{
 			Reload ();
-
-			AppleSdkSettings.Changed += delegate {
-				Native = new AppleIPhoneSdk (AppleSdkSettings.DeveloperRoot, AppleSdkSettings.DeveloperRootVersionPlist);
-				Watch = new AppleWatchSdk (AppleSdkSettings.DeveloperRoot, AppleSdkSettings.DeveloperRootVersionPlist);
-				TVOS = new AppleTVOSSdk (AppleSdkSettings.DeveloperRoot, AppleSdkSettings.DeveloperRootVersionPlist);
-			};
 		}
 
 		public static void CheckInfoCaches ()
 		{
-			AppleSdkSettings.CheckChanged ();
 			MonoTouch.CheckCaches ();
 		}