diff --git a/.external b/.external
index 9417d72df09..99622e376dc 100644
--- a/.external
+++ b/.external
@@ -1,2 +1,2 @@
-xamarin/monodroid:main@76c04cd15eca7afc269a6d26296e9d2db6f79be2
+xamarin/monodroid:main@1f2ce156245ef1bf63ec8014882d283b3224216b
 mono/mono:2020-02@c633fe923832f0c3db3c4e6aa98e5592bf5a06e7
diff --git a/Directory.Build.props b/Directory.Build.props
index 475241e3a85..818aa75c326 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -26,7 +26,7 @@
 
   <!-- Common <PackageReference/> versions -->
   <PropertyGroup>
-    <LibZipSharpVersion>1.0.24</LibZipSharpVersion>
+    <LibZipSharpVersion>2.0.0-alpha6</LibZipSharpVersion>
     <MicroBuildCoreVersion>0.4.1</MicroBuildCoreVersion>
     <MonoCecilVersion>0.11.2</MonoCecilVersion>
     <NuGetApiPackageVersion>5.4.0</NuGetApiPackageVersion>
diff --git a/build-tools/create-packs/SignList.xml b/build-tools/create-packs/SignList.xml
index d12685c5abc..8fcd5a2efc7 100644
--- a/build-tools/create-packs/SignList.xml
+++ b/build-tools/create-packs/SignList.xml
@@ -1,7 +1,6 @@
 <Project>
   <ItemGroup>
     <!-- Do not sign files that already have a signature -->
-    <Skip Include="libzip*" />
     <Skip Include="libZipSharp*" />
   </ItemGroup>
 
diff --git a/build-tools/debian-metadata/rules b/build-tools/debian-metadata/rules
index 18bd49a9718..fc05bf66041 100755
--- a/build-tools/debian-metadata/rules
+++ b/build-tools/debian-metadata/rules
@@ -21,7 +21,7 @@ override_dh_install:
 	rm -f bin/*/lib/xamarin.android/xbuild/Xamarin/Android/opt.exe
 	rm -f bin/*/lib/xamarin.android/xbuild/Xamarin/Android/aapt2.exe
 	rm -f bin/*/lib/xamarin.android/xbuild/Xamarin/Android/libwinpthread-1.dll
-	rm -f bin/*/lib/xamarin.android/xbuild/Xamarin/Android/libzip.dll
+	rm -f bin/*/lib/xamarin.android/xbuild/Xamarin/Android/libZipSharpNative.dll
 
 	dh_install
 
diff --git a/build-tools/installers/create-installers.targets b/build-tools/installers/create-installers.targets
index 5d2537a7cd0..1caf5d86889 100644
--- a/build-tools/installers/create-installers.targets
+++ b/build-tools/installers/create-installers.targets
@@ -193,10 +193,12 @@
     <_MSBuildFiles Include="@(AndroidSupportedTargetJitAbi->'$(MSBuildSrcDir)\lib\interpreter-%(Identity)\libmonosgen-2.0.so')"               ExcludeFromAndroidNETSdk="true" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\libZipSharp.dll" />
     <_MSBuildFiles Include="@(_LocalizationLanguages->'$(MSBuildSrcDir)\%(Identity)\libZipSharp.resources.dll')" />
-    <_MSBuildFiles Include="$(MSBuildSrcDir)\libZipSharp.dll.config" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\libZipSharp.pdb" />
-    <_MSBuildFiles Include="$(MSBuildSrcDir)\Mono.Posix.NETStandard.dll" />
-    <_MSBuildFiles Include="$(MSBuildSrcDir)\Mono.Posix.NETStandard.pdb" />
+    <_MSBuildFiles Include="$(MSBuildSrcDir)\Mono.Unix.dll" />
+    <_MSBuildFiles Include="$(MSBuildSrcDir)\Mono.Unix.dll.config" />
+    <_MSBuildFiles Include="$(MSBuildSrcDir)\Mono.Unix.pdb" />
+    <_MSBuildFiles Include="$(MSBuildSrcDir)\libMono.Unix.so" />
+    <_MSBuildFiles Include="$(MSBuildSrcDir)\libMono.Unix.dylib" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\Mono.Profiler.Log.dll" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\Mono.Profiler.Log.pdb" />
     <_MSBuildFiles Include="$(MSBuildSrcDir)\logcat-parse.exe"      ExcludeFromAndroidNETSdk="true" />
@@ -304,10 +306,10 @@
     <_MSBuildTargetsSrcFiles Include="$(MSBuildTargetsSrcDir)\Xamarin.Android.DefaultOutputPaths.targets" />
   </ItemGroup>
   <ItemGroup>
-    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\libzip.dll" />
-    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\libzip.pdb" />
-    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\lib64\libzip.dll" />
-    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\lib64\libzip.pdb" />
+    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\libZipSharpNative.dll" />
+    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\libZipSharpNative.pdb" />
+    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\lib64\libZipSharpNative.dll" />
+    <_MSBuildFilesWin Include="$(MSBuildSrcDir)\lib64\libZipSharpNative.pdb" />
     <_MSBuildFilesWin Include="$(MSBuildSrcDir)\proguard\bin\proguard.bat" />
     <_MSBuildFilesWin Include="$(MSBuildSrcDir)\aapt2.exe" />
     <_MSBuildFilesWin Include="$(MSBuildSrcDir)\ndk\aarch64-linux-android-as.exe" />
@@ -368,9 +370,10 @@
     <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\lib\host-$(HostOS)\libmonosgen-2.0.$(LibExtension)"          ExcludeFromAndroidNETSdk="true" />
     <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\lib\host-$(HostOS)\libxamarin-app.$(LibExtension)"           ExcludeFromAndroidNETSdk="true" />
     <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\lib\host-$(HostOS)\libxa-internal-api.$(LibExtension)"       ExcludeFromAndroidNETSdk="true" />
-    <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\libzip.$(LibExtension)" />
-    <!-- A second libMonoPosixHelper.dylib is needed for libZipSharp.dll to load -->
-    <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\libMonoPosixHelper.$(LibExtension)" />
+    <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\libZipSharpNative.$(LibExtension)" />
+    <!-- A second libMono.Unix.{dylib,so} is needed for libZipSharp.dll to load -->
+    <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\libMono.Unix.so" />
+    <_MSBuildFilesUnixSign Include="$(MSBuildSrcDir)\libMono.Unix.dylib" />
     <_MSBuildFilesUnix Include="$(MSBuildSrcDir)\proguard\bin\proguard.sh" />
   </ItemGroup>
   <!-- Allow us to exclude mono bundle files for PR builds -->
diff --git a/build-tools/xaprepare/xaprepare/xaprepare.csproj b/build-tools/xaprepare/xaprepare/xaprepare.csproj
index e66b5cc2c32..5a9591552c6 100644
--- a/build-tools/xaprepare/xaprepare/xaprepare.csproj
+++ b/build-tools/xaprepare/xaprepare/xaprepare.csproj
@@ -52,7 +52,7 @@
     <PackageReference Include="7-Zip.CommandLine" Version="18.1.0" GeneratePathProperty="true" />
     <PackageReference Include="Kajabity.Tools.Java" Version="0.2.6862.30334" />
     <PackageReference Include="Mono.Options" Version="$(MonoOptionsVersion)" />
-    <PackageReference Include="Mono.Posix.NetStandard" Version="1.0.0" />
+    <PackageReference Include="Mono.Unix" Version="7.0.0-alpha8.21302.6" />
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="Xamarin.LibZipSharp" Version="$(LibZipSharpVersion)" GeneratePathProperty="true" />
     <PackageReference Include="System.Text.Encoding.CodePages" Version="5.0.0" />
diff --git a/external/xamarin-android-tools b/external/xamarin-android-tools
index 683f37508b5..49936d60ce8 160000
--- a/external/xamarin-android-tools
+++ b/external/xamarin-android-tools
@@ -1 +1 @@
-Subproject commit 683f37508b56c76c24b3287a5687743438625341
+Subproject commit 49936d60ce808d706f9e4c1ace71c2fe9c604733
diff --git a/src/Xamarin.Android.Build.Tasks/Resources/Mono.Unix.dll.config b/src/Xamarin.Android.Build.Tasks/Resources/Mono.Unix.dll.config
new file mode 100644
index 00000000000..353e6894013
--- /dev/null
+++ b/src/Xamarin.Android.Build.Tasks/Resources/Mono.Unix.dll.config
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <dllmap dll="Mono.Unix" os="linux" cpu="x86-64" wordsize="64" target="libMono.Unix.so" />
+  <dllmap dll="Mono.Unix" os="osx" target="libMono.Unix.dylib" />
+</configuration>
diff --git a/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/PackagingTest.cs b/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/PackagingTest.cs
index df07f769ba8..972e2832852 100644
--- a/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/PackagingTest.cs
+++ b/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/PackagingTest.cs
@@ -451,7 +451,7 @@ public void CheckAapt2WarningsDoNotGenerateErrors ()
 			//https://github.com/xamarin/xamarin-android/issues/3083
 			var proj = new XamarinAndroidApplicationProject () {
 				IsRelease = true,
-				TargetFrameworkVersion = Versions.Oreo_27,
+				TargetFrameworkVersion = Xamarin.ProjectTools.Versions.Oreo_27,
 				UseLatestPlatformSdk = false,
 			};
 			proj.PackageReferences.Add (KnownPackages.XamarinForms_2_3_4_231);
diff --git a/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.csproj b/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.csproj
index 3c1b6e67077..471a70260c9 100644
--- a/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.csproj
+++ b/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.csproj
@@ -366,12 +366,6 @@
     <None Include="startup-xf.aotprofile">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
-    <None Include="$(PkgMono_Posix_NETStandard)\runtimes\osx\native\libMonoPosixHelper.dylib">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Include="$(PkgMono_Posix_NETStandard)\runtimes\linux-x64\native\libMonoPosixHelper.so">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.targets b/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.targets
index b622d00418a..77356129154 100644
--- a/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.targets
+++ b/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Build.Tasks.targets
@@ -351,16 +351,49 @@
     <_ExtraPackageTarget Include="$(OutputPath)\libZipSharp.pdb" />
     <_ExtraPackageSource Include="$(PkgXamarin_Build_AsyncTask)\lib\$(TargetFrameworkNETStandard)\Xamarin.Build.AsyncTask.pdb" />
     <_ExtraPackageTarget Include="$(OutputPath)\Xamarin.Build.AsyncTask.pdb" />
-    <_ExtraPackageSource Include="$(PkgMono_Posix_NETStandard)\ref\$(TargetFrameworkNETStandard)\Mono.Posix.NETStandard.pdb" />
-    <_ExtraPackageTarget Include="$(OutputPath)\Mono.Posix.NETStandard.pdb" />
-    <_ExtraPackageSource Include="$(PkgMono_Posix_NETStandard)\ref\$(TargetFrameworkNETStandard)\Mono.Posix.NETStandard.dll" />
-    <_ExtraPackageTarget Include="$(OutputPath)\Mono.Posix.NETStandard.dll" />
+    <_ExtraPackageSource Include="$(PkgMono_Unix)\lib\$(TargetFrameworkNETStandard)\Mono.Unix.pdb" />
+    <_ExtraPackageTarget Include="$(OutputPath)\Mono.Unix.pdb" />
+
+    <_ExtraPackageSource Include="$(MSBuildThisFileDirectory)\Resources\Mono.Unix.dll.config" />
+    <_ExtraPackageTarget Include="$(OutputPath)\Mono.Unix.dll.config" />
+
+    <_ExtraPackageSource Include="$(PkgMono_Unix)\lib\$(TargetFrameworkNETStandard)\Mono.Unix.dll" />
+    <_ExtraPackageTarget Include="$(OutputPath)\Mono.Unix.dll" />
+
+    <_ExtraPackageSource Include="$(PkgMono_Unix)\runtimes\linux-x64\native\libMono.Unix.so" />
+    <_ExtraPackageTarget Include="$(OutputPath)\libMono.Unix.so" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <_MonoUnixDylib Include="$(PkgMono_Unix)\runtimes\osx-arm64\native\libMono.Unix.dylib" Condition=" '$(HostOS)' == 'Darwin' " />
+    <_MonoUnixDylib Include="$(PkgMono_Unix)\runtimes\osx-x64\native\libMono.Unix.dylib" />
   </ItemGroup>
 
+  <PropertyGroup>
+    <_MonoUnixOutputDylib>$(OutputPath)\libMono.Unix.dylib</_MonoUnixOutputDylib>
+  </PropertyGroup>
+
+  <!--
+      On operating systems other than macOS we just need to copy a single .dylib, so that pack creation works
+  -->
+  <Target Name="_MakeMonoUnixFatBinariesOSX"
+      Inputs="@(_MonoUnixDylib)"
+      Outputs="$(_MonoUnixOutputDylib)">
+    <Exec
+        Command="lipo @(_MonoUnixDylib->'&quot;%(FullPath)&quot;', ' ') -create -output &quot;$(_MonoUnixOutputDylib)&quot;"
+        Condition=" '$(HostOS)' == 'Darwin' "
+    />
+    <Copy
+        SourceFiles="@(_MonoUnixDylib)"
+        DestinationFolder="$(OutputPath)"
+    />
+  </Target>
+
   <!-- Copy package ref symbols for our installers. '$(Pkg*)' props are set during NuGet restore when GeneratePathProperty="true" -->
   <Target Name="_CopyExtraPackageContent"
       Inputs="@(_ExtraPackageSource)"
-      Outputs="@(_ExtraPackageTarget)" >
+      Outputs="@(_ExtraPackageTarget)"
+      DependsOnTargets="_MakeMonoUnixFatBinariesOSX">
     <Copy
         SourceFiles="@(_ExtraPackageSource)"
         DestinationFolder="$(OutputPath)"
@@ -368,7 +401,7 @@
     />
   </Target>
 
-  <Target Name="_Remove32BitLinux" Condition="Exists ('$(OutputPath)lib32\libzip.so')" AfterTargets="CopyFilesToOutputDirectory">
-    <Delete Files="$(OutputPath)lib32\libzip.so" />
+  <Target Name="_Remove32BitLinux" Condition="Exists ('$(OutputPath)lib32\libZipSharpNative.so')" AfterTargets="CopyFilesToOutputDirectory">
+    <Delete Files="$(OutputPath)lib32\libZipSharpNative.so" />
   </Target>
 </Project>
diff --git a/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets b/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets
index a81127c90d4..eb5dc5c7855 100644
--- a/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets
+++ b/src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets
@@ -91,6 +91,7 @@ Copyright (C) 2011-2012 Xamarin. All rights reserved.
 <UsingTask TaskName="Xamarin.Android.Tasks.PrepareAbiItems" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
 <UsingTask TaskName="Xamarin.Android.Tasks.WriteLockFile" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
 <UsingTask TaskName="GenerateCompressedAssembliesNativeSourceFiles" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
+
 <!--
 *******************************************
   Extensibility hook that allows VS to
@@ -102,7 +103,6 @@ Copyright (C) 2011-2012 Xamarin. All rights reserved.
         Condition="Exists('$(MSBuildThisFileDirectory)$(MSBuildThisFileName).Before.targets')"/>
 
 
-
 <!--
 *******************************************
           Code Analysis Setup
diff --git a/tests/MSBuildDeviceIntegration/Tests/InstantRunTest.cs b/tests/MSBuildDeviceIntegration/Tests/InstantRunTest.cs
index c1065b4b867..0b79aa712d2 100644
--- a/tests/MSBuildDeviceIntegration/Tests/InstantRunTest.cs
+++ b/tests/MSBuildDeviceIntegration/Tests/InstantRunTest.cs
@@ -297,6 +297,10 @@ public void InstantRunNativeLibrary ([Values ("dx", "d8")] string dexTool)
 					nativeLib,
 				},
 			};
+			if (Builder.UseDotNet) {
+				//NOTE: in .NET 6 by default an x86_64 emulator would fall back to x86 if we don't set this.
+				proj.SetAndroidSupportedAbis (DeviceAbi);
+			}
 			proj.SetDefaultTargetDevice ();
 			using (var b = CreateApkBuilder (Path.Combine ("temp", TestName))) {
 				Assert.IsTrue (b.Install (proj), "install should have succeeded. 0");