diff --git a/src/ReactiveUI.Events.WPF/ReactiveUI.Events.WPF.csproj b/src/ReactiveUI.Events.WPF/ReactiveUI.Events.WPF.csproj
index 793c189368..c55e2f75fd 100644
--- a/src/ReactiveUI.Events.WPF/ReactiveUI.Events.WPF.csproj
+++ b/src/ReactiveUI.Events.WPF/ReactiveUI.Events.WPF.csproj
@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-      <PackageReference Include="System.Reactive" Version="4.3.2" />
+      <PackageReference Include="System.Reactive" Version="4.4.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/ReactiveUI.Events.Winforms/ReactiveUI.Events.Winforms.csproj b/src/ReactiveUI.Events.Winforms/ReactiveUI.Events.Winforms.csproj
index 9032ea9841..6ff7defcb1 100644
--- a/src/ReactiveUI.Events.Winforms/ReactiveUI.Events.Winforms.csproj
+++ b/src/ReactiveUI.Events.Winforms/ReactiveUI.Events.Winforms.csproj
@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-      <PackageReference Include="System.Reactive" Version="4.3.2" />
+      <PackageReference Include="System.Reactive" Version="4.4.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/ReactiveUI.Events/ReactiveUI.Events.csproj b/src/ReactiveUI.Events/ReactiveUI.Events.csproj
index 6164df4d4f..02eb894aa9 100644
--- a/src/ReactiveUI.Events/ReactiveUI.Events.csproj
+++ b/src/ReactiveUI.Events/ReactiveUI.Events.csproj
@@ -13,7 +13,7 @@
     <Compile Remove="*.cs" />
     <None Include="*.cs" />
     <PackageReference Include="Pharmacist.Common" Version="1.*" />
-    <PackageReference Include="System.Reactive" Version="4.3.2" />
+    <PackageReference Include="System.Reactive" Version="4.4.1" />
   </ItemGroup>
 
   <ItemGroup Condition="  $(TargetFramework.StartsWith('uap')) ">
diff --git a/src/ReactiveUI.Fody.Helpers/ReactiveUI.Fody.Helpers.csproj b/src/ReactiveUI.Fody.Helpers/ReactiveUI.Fody.Helpers.csproj
index 3872dd9432..417a531cee 100644
--- a/src/ReactiveUI.Fody.Helpers/ReactiveUI.Fody.Helpers.csproj
+++ b/src/ReactiveUI.Fody.Helpers/ReactiveUI.Fody.Helpers.csproj
@@ -18,7 +18,7 @@
   <ItemGroup>
     <PackageReference Include="Fody" Version="6.1.1" PrivateAssets="None" />
     <PackageReference Include="FodyPackaging" Version="6.1.1" PrivateAssets="All" />
-    <PackageReference Include="System.Reactive" Version="4.3.2" />
+    <PackageReference Include="System.Reactive" Version="4.4.1" />
   </ItemGroup>
 
   <ItemGroup Condition="$(TargetFramework.StartsWith('netstandard'))">
diff --git a/src/ReactiveUI.Winforms/ReactiveUI.Winforms.csproj b/src/ReactiveUI.Winforms/ReactiveUI.Winforms.csproj
index d6bf4a55cb..c97d0a8f05 100644
--- a/src/ReactiveUI.Winforms/ReactiveUI.Winforms.csproj
+++ b/src/ReactiveUI.Winforms/ReactiveUI.Winforms.csproj
@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-      <PackageReference Include="System.Reactive" Version="4.3.2" />
+      <PackageReference Include="System.Reactive" Version="4.4.1" />
   </ItemGroup>
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) ">
     <Reference Include="System.Windows.Forms" />
diff --git a/src/ReactiveUI.Wpf/ReactiveUI.Wpf.csproj b/src/ReactiveUI.Wpf/ReactiveUI.Wpf.csproj
index 90e11301fa..da33e1c39f 100644
--- a/src/ReactiveUI.Wpf/ReactiveUI.Wpf.csproj
+++ b/src/ReactiveUI.Wpf/ReactiveUI.Wpf.csproj
@@ -14,7 +14,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Reactive" Version="4.3.2" />
+    <PackageReference Include="System.Reactive" Version="4.4.1" />
   </ItemGroup>
   <ItemGroup>
     <Compile Remove="..\ReactiveUI\Platforms\windows-common\BindingTypeConverters.cs" />
diff --git a/src/ReactiveUI/ReactiveUI.csproj b/src/ReactiveUI/ReactiveUI.csproj
index d567491e17..475e3f8b40 100644
--- a/src/ReactiveUI/ReactiveUI.csproj
+++ b/src/ReactiveUI/ReactiveUI.csproj
@@ -14,7 +14,7 @@
     <None Include="Platforms\**\*.cs" />
     <PackageReference Include="Splat" Version="9.*" />
     <PackageReference Include="DynamicData" Version="6.*" />
-    <PackageReference Include="System.Reactive" Version="4.3.2" />
+    <PackageReference Include="System.Reactive" Version="4.4.1" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard')) ">