diff --git a/samples/ControlCatalog.Android/ControlCatalog.Android.csproj b/samples/ControlCatalog.Android/ControlCatalog.Android.csproj
index 8df2a8764f..2f32a0b5ee 100644
--- a/samples/ControlCatalog.Android/ControlCatalog.Android.csproj
+++ b/samples/ControlCatalog.Android/ControlCatalog.Android.csproj
@@ -158,7 +158,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="System.Reactive">
-      <Version>3.1.1</Version>
+      <Version>3.0.0</Version>
     </PackageReference>
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
diff --git a/src/Android/Avalonia.Android/Avalonia.Android.csproj b/src/Android/Avalonia.Android/Avalonia.Android.csproj
index 01fa9f9241..f22d592544 100644
--- a/src/Android/Avalonia.Android/Avalonia.Android.csproj
+++ b/src/Android/Avalonia.Android/Avalonia.Android.csproj
@@ -140,22 +140,22 @@
   </Target>
   -->
   <ItemGroup>
-    <PackageReference Include="System.Collections" Version="4.0.11" />
-    <PackageReference Include="System.Collections.Concurrent" Version="4.0.12" />
-    <PackageReference Include="System.ComponentModel" Version="4.0.1" />
-    <PackageReference Include="System.Diagnostics.Debug" Version="4.0.11" />
-    <PackageReference Include="System.Diagnostics.Tools" Version="4.0.1" />
-    <PackageReference Include="System.Globalization" Version="4.0.11" />
-    <PackageReference Include="System.Linq" Version="4.1.0" />
+    <PackageReference Include="System.Collections" Version="4.3.0" />
+    <PackageReference Include="System.Collections.Concurrent" Version="4.3.0" />
+    <PackageReference Include="System.ComponentModel" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Debug" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Tools" Version="4.3.0" />
+    <PackageReference Include="System.Globalization" Version="4.3.0" />
+    <PackageReference Include="System.Linq" Version="4.3.0" />
     <PackageReference Include="System.Reactive.Core" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Interfaces" Version="3.0.0" />
     <PackageReference Include="System.Reactive.PlatformServices" Version="3.0.0" />
-    <PackageReference Include="System.Reflection" Version="4.1.0" />
-    <PackageReference Include="System.Resources.ResourceManager" Version="4.0.1" />
-    <PackageReference Include="System.Runtime" Version="4.1.0" />
-    <PackageReference Include="System.Runtime.Extensions" Version="4.1.0" />
-    <PackageReference Include="System.Threading" Version="4.0.11" />
-    <PackageReference Include="System.Threading.Tasks" Version="4.0.11" />
+    <PackageReference Include="System.Reflection" Version="4.3.0" />
+    <PackageReference Include="System.Resources.ResourceManager" Version="4.3.0" />
+    <PackageReference Include="System.Runtime" Version="4.3.0" />
+    <PackageReference Include="System.Runtime.Extensions" Version="4.3.0" />
+    <PackageReference Include="System.Threading" Version="4.3.0" />
+    <PackageReference Include="System.Threading.Tasks" Version="4.3.0" />
   </ItemGroup>
   <Import Project="$(MSBuildThisFileDirectory)..\..\Shared\nuget.workaround.targets" />
   <PropertyGroup Condition="'$(UseRoslynPathHack)' == ''">
diff --git a/src/Android/Avalonia.AndroidTestApplication/Avalonia.AndroidTestApplication.csproj b/src/Android/Avalonia.AndroidTestApplication/Avalonia.AndroidTestApplication.csproj
index a12356b959..156b2b1fe3 100644
--- a/src/Android/Avalonia.AndroidTestApplication/Avalonia.AndroidTestApplication.csproj
+++ b/src/Android/Avalonia.AndroidTestApplication/Avalonia.AndroidTestApplication.csproj
@@ -164,25 +164,25 @@
     <PackageReference Include="Serilog" Version="2.4.0" />
     <PackageReference Include="Splat" Version="2.0.0" />
     <PackageReference Include="Sprache" Version="2.1.0" />
-    <PackageReference Include="System.Collections" Version="4.0.11" />
-    <PackageReference Include="System.Collections.Concurrent" Version="4.0.12" />
-    <PackageReference Include="System.ComponentModel" Version="4.0.1" />
-    <PackageReference Include="System.Diagnostics.Debug" Version="4.0.11" />
-    <PackageReference Include="System.Diagnostics.Tools" Version="4.0.1" />
-    <PackageReference Include="System.Globalization" Version="4.0.11" />
-    <PackageReference Include="System.Linq" Version="4.1.0" />
+    <PackageReference Include="System.Collections" Version="4.3.0" />
+    <PackageReference Include="System.Collections.Concurrent" Version="4.3.0" />
+    <PackageReference Include="System.ComponentModel" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Debug" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Tools" Version="4.3.0" />
+    <PackageReference Include="System.Globalization" Version="4.3.0" />
+    <PackageReference Include="System.Linq" Version="4.3.0" />
     <PackageReference Include="System.Reactive" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Core" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Interfaces" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Linq" Version="3.0.0" />
     <PackageReference Include="System.Reactive.PlatformServices" Version="3.0.0" />
-    <PackageReference Include="System.Reflection" Version="4.1.0" />
-    <PackageReference Include="System.Resources.ResourceManager" Version="4.0.1" />
-    <PackageReference Include="System.Runtime" Version="4.1.0" />
-    <PackageReference Include="System.Runtime.Extensions" Version="4.1.0" />
-    <PackageReference Include="System.Text.RegularExpressions" Version="4.1.0" />
-    <PackageReference Include="System.Threading" Version="4.0.11" />
-    <PackageReference Include="System.Threading.Tasks" Version="4.0.11" />
+    <PackageReference Include="System.Reflection" Version="4.3.0" />
+    <PackageReference Include="System.Resources.ResourceManager" Version="4.3.0" />
+    <PackageReference Include="System.Runtime" Version="4.3.0" />
+    <PackageReference Include="System.Runtime.Extensions" Version="4.3.0" />
+    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.0" />
+    <PackageReference Include="System.Threading" Version="4.3.0" />
+    <PackageReference Include="System.Threading.Tasks" Version="4.3.0" />
   </ItemGroup>
   <Import Project="$(MSBuildThisFileDirectory)..\..\Shared\nuget.workaround.targets" />
 </Project>
\ No newline at end of file
diff --git a/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj b/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj
index b71ae65347..3fa460170f 100644
--- a/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj
+++ b/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj
@@ -290,14 +290,14 @@
   </Target>
   <ItemGroup>
     <PackageReference Include="Sprache" Version="2.1.0" />
-    <PackageReference Include="System.Globalization" Version="4.0.11" />
-    <PackageReference Include="System.Linq" Version="4.1.0" />
+    <PackageReference Include="System.Globalization" Version="4.3.0" />
+    <PackageReference Include="System.Linq" Version="4.3.0" />
     <PackageReference Include="System.Reactive" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Core" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Interfaces" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Linq" Version="3.0.0" />
     <PackageReference Include="System.Reactive.PlatformServices" Version="3.0.0" />
-    <PackageReference Include="System.Runtime" Version="4.1.0" />
-    <PackageReference Include="System.Text.RegularExpressions" Version="4.1.0" />
+    <PackageReference Include="System.Runtime" Version="4.3.0" />
+    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.0" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/iOS/Avalonia.iOS/Avalonia.iOS.csproj b/src/iOS/Avalonia.iOS/Avalonia.iOS.csproj
index aab96d1456..05fb99e3ef 100644
--- a/src/iOS/Avalonia.iOS/Avalonia.iOS.csproj
+++ b/src/iOS/Avalonia.iOS/Avalonia.iOS.csproj
@@ -105,25 +105,25 @@
   <Import Project="..\..\Shared\PlatformSupport\PlatformSupport.projitems" Label="Shared" />
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
   <ItemGroup>
-    <PackageReference Include="System.Collections" Version="4.0.11" />
-    <PackageReference Include="System.Collections.Concurrent" Version="4.0.12" />
-    <PackageReference Include="System.ComponentModel" Version="4.0.1" />
-    <PackageReference Include="System.Diagnostics.Debug" Version="4.0.11" />
-    <PackageReference Include="System.Diagnostics.Tools" Version="4.0.1" />
-    <PackageReference Include="System.Globalization" Version="4.0.11" />
-    <PackageReference Include="System.Linq" Version="4.1.0" />
+    <PackageReference Include="System.Collections" Version="4.3.0" />
+    <PackageReference Include="System.Collections.Concurrent" Version="4.3.0" />
+    <PackageReference Include="System.ComponentModel" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Debug" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Tools" Version="4.3.0" />
+    <PackageReference Include="System.Globalization" Version="4.3.0" />
+    <PackageReference Include="System.Linq" Version="4.3.0" />
     <PackageReference Include="System.Reactive" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Core" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Interfaces" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Linq" Version="3.0.0" />
     <PackageReference Include="System.Reactive.PlatformServices" Version="3.0.0" />
-    <PackageReference Include="System.Reflection" Version="4.1.0" />
-    <PackageReference Include="System.Resources.ResourceManager" Version="4.0.1" />
-    <PackageReference Include="System.Runtime" Version="4.1.0" />
-    <PackageReference Include="System.Runtime.Extensions" Version="4.1.0" />
-    <PackageReference Include="System.Runtime.InteropServices.WindowsRuntime" Version="4.0.1" />
-    <PackageReference Include="System.Threading" Version="4.0.11" />
-    <PackageReference Include="System.Threading.Tasks" Version="4.0.11" />
+    <PackageReference Include="System.Reflection" Version="4.3.0" />
+    <PackageReference Include="System.Resources.ResourceManager" Version="4.3.0" />
+    <PackageReference Include="System.Runtime" Version="4.3.0" />
+    <PackageReference Include="System.Runtime.Extensions" Version="4.3.0" />
+    <PackageReference Include="System.Runtime.InteropServices.WindowsRuntime" Version="4.3.0" />
+    <PackageReference Include="System.Threading" Version="4.3.0" />
+    <PackageReference Include="System.Threading.Tasks" Version="4.3.0" />
   </ItemGroup>
   <Import Project="$(MSBuildThisFileDirectory)..\..\Shared\nuget.workaround.targets" />
 </Project>
\ No newline at end of file
diff --git a/src/iOS/Avalonia.iOSTestApplication/Avalonia.iOSTestApplication.csproj b/src/iOS/Avalonia.iOSTestApplication/Avalonia.iOSTestApplication.csproj
index dbaba1d36d..b66546c591 100644
--- a/src/iOS/Avalonia.iOSTestApplication/Avalonia.iOSTestApplication.csproj
+++ b/src/iOS/Avalonia.iOSTestApplication/Avalonia.iOSTestApplication.csproj
@@ -187,25 +187,25 @@
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
   <ItemGroup>
-    <PackageReference Include="System.Collections" Version="4.0.11" />
-    <PackageReference Include="System.Collections.Concurrent" Version="4.0.12" />
-    <PackageReference Include="System.ComponentModel" Version="4.0.1" />
-    <PackageReference Include="System.Diagnostics.Debug" Version="4.0.11" />
-    <PackageReference Include="System.Diagnostics.Tools" Version="4.0.1" />
-    <PackageReference Include="System.Globalization" Version="4.0.11" />
-    <PackageReference Include="System.Linq" Version="4.1.0" />
+    <PackageReference Include="System.Collections" Version="4.3.0" />
+    <PackageReference Include="System.Collections.Concurrent" Version="4.3.0" />
+    <PackageReference Include="System.ComponentModel" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Debug" Version="4.3.0" />
+    <PackageReference Include="System.Diagnostics.Tools" Version="4.3.0" />
+    <PackageReference Include="System.Globalization" Version="4.3.0" />
+    <PackageReference Include="System.Linq" Version="4.3.0" />
     <PackageReference Include="System.Reactive" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Core" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Interfaces" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Linq" Version="3.0.0" />
     <PackageReference Include="System.Reactive.PlatformServices" Version="3.0.0" />
-    <PackageReference Include="System.Reflection" Version="4.1.0" />
-    <PackageReference Include="System.Resources.ResourceManager" Version="4.0.1" />
-    <PackageReference Include="System.Runtime" Version="4.1.0" />
-    <PackageReference Include="System.Runtime.Extensions" Version="4.1.0" />
-    <PackageReference Include="System.Runtime.InteropServices.WindowsRuntime" Version="4.0.1" />
-    <PackageReference Include="System.Threading" Version="4.0.11" />
-    <PackageReference Include="System.Threading.Tasks" Version="4.0.11" />
+    <PackageReference Include="System.Reflection" Version="4.3.0" />
+    <PackageReference Include="System.Resources.ResourceManager" Version="4.3.0" />
+    <PackageReference Include="System.Runtime" Version="4.3.0" />
+    <PackageReference Include="System.Runtime.Extensions" Version="4.3.0" />
+    <PackageReference Include="System.Runtime.InteropServices.WindowsRuntime" Version="4.3.0" />
+    <PackageReference Include="System.Threading" Version="4.3.0" />
+    <PackageReference Include="System.Threading.Tasks" Version="4.3.0" />
   </ItemGroup>
   <Import Project="$(MSBuildThisFileDirectory)..\..\Shared\nuget.workaround.targets" />
 </Project>
\ No newline at end of file
diff --git a/tests/Avalonia.Markup.UnitTests/Avalonia.Markup.UnitTests.csproj b/tests/Avalonia.Markup.UnitTests/Avalonia.Markup.UnitTests.csproj
index 8778f6752d..69056175a7 100644
--- a/tests/Avalonia.Markup.UnitTests/Avalonia.Markup.UnitTests.csproj
+++ b/tests/Avalonia.Markup.UnitTests/Avalonia.Markup.UnitTests.csproj
@@ -114,7 +114,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Reactive.Testing" Version="3.0.0" />
     <PackageReference Include="Moq" Version="4.7.1" />
-    <PackageReference Include="System.ComponentModel.Annotations" Version="4.1.0" />
+    <PackageReference Include="System.ComponentModel.Annotations" Version="4.3.0" />
     <PackageReference Include="System.Reactive" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Core" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Interfaces" Version="3.0.0" />
diff --git a/tests/Avalonia.Markup.Xaml.UnitTests/Avalonia.Markup.Xaml.UnitTests.csproj b/tests/Avalonia.Markup.Xaml.UnitTests/Avalonia.Markup.Xaml.UnitTests.csproj
index 8ef1e1ac18..adb2aa7376 100644
--- a/tests/Avalonia.Markup.Xaml.UnitTests/Avalonia.Markup.Xaml.UnitTests.csproj
+++ b/tests/Avalonia.Markup.Xaml.UnitTests/Avalonia.Markup.Xaml.UnitTests.csproj
@@ -159,7 +159,7 @@
   -->
   <ItemGroup>
     <PackageReference Include="Moq" Version="4.7.1" />
-    <PackageReference Include="Splat" Version="1.6.2" />
+    <PackageReference Include="Splat" Version="2.0.0" />
     <PackageReference Include="Sprache" Version="2.1.0" />
     <PackageReference Include="System.Reactive.Core" Version="3.0.0" />
     <PackageReference Include="System.Reactive.Interfaces" Version="3.0.0" />