diff --git a/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.DotNet.csproj b/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.DotNet.csproj
index fed0adb..c71bbd2 100644
--- a/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.DotNet.csproj
+++ b/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.DotNet.csproj
@@ -28,8 +28,8 @@
     <PackageReference Include="Newtonsoft.Json" Version="$(NewtonsoftJsonVersion)" />
     <PackageReference Include="protobuf-net" Version="$(ProtobufVersion)" />
     <PackageReference Include="Microsoft.Hadoop.Avro" Version="$(AvroVersion)" />
-    <PackageReference Include="System.Reactive.Core" Version="$(RxVersion)" />
-    <PackageReference Include="System.Reactive.Interfaces" Version="$(RxVersion)" />
+    <PackageReference Include="System.Reactive.Core" Version="$(SystemReactiveVersion)" />
+    <PackageReference Include="System.Reactive.Interfaces" Version="$(SystemReactiveVersion)" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Runtime.Serialization" />
diff --git a/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.csproj b/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.csproj
index 4bdf723..41095fa 100644
--- a/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.csproj
+++ b/lang/cs/Org.Apache.REEF.Common/Org.Apache.REEF.Common.csproj
@@ -1,4 +1,4 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
@@ -39,14 +39,14 @@
     <Reference Include="protobuf-net">
       <HintPath>$(PackagesDir)\protobuf-net.$(ProtobufVersion)\lib\net40\protobuf-net.dll</HintPath>
     </Reference>
-    <Reference Include="System.Reactive.Core">
-      <HintPath>$(PackagesDir)\Rx-Core.$(RxVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="System.Reactive.Interfaces">
-      <HintPath>$(PackagesDir)\Rx-Interfaces.$(RxVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Reactive.Core">
+      <HintPath>$(PackagesDir)\System.Reactive.Core.$(SystemReactiveVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces">
+      <HintPath>$(PackagesDir)\System.Reactive.Interfaces.$(SystemReactiveVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+    </Reference>
     <Reference Include="System.Runtime.Serialization" />
     <Reference Include="System.Xml" />
   </ItemGroup>
@@ -289,4 +289,4 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
   <Import Project="$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets" Condition="Exists('$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets')" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lang/cs/Org.Apache.REEF.Common/packages.config b/lang/cs/Org.Apache.REEF.Common/packages.config
index 0b76c0c..66ec02f 100644
--- a/lang/cs/Org.Apache.REEF.Common/packages.config
+++ b/lang/cs/Org.Apache.REEF.Common/packages.config
@@ -21,7 +21,7 @@
   <package id="Microsoft.Hadoop.Avro" version="1.5.6" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
   <package id="protobuf-net" version="2.0.0.668" targetFramework="net45" />
-  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
-  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
   <package id="StyleCop.MSBuild" version="4.7.49.1" targetFramework="net45" developmentDependency="true" />
-</packages>
\ No newline at end of file
+  <package id="System.Reactive.Core" version="3.1.1" targetFramework="net451" />
+  <package id="System.Reactive.Interfaces" version="3.1.1" targetFramework="net451" />
+</packages>
diff --git a/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.DotNet.csproj b/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.DotNet.csproj
index 17bfdfa..784c6ed 100644
--- a/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.DotNet.csproj
+++ b/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.DotNet.csproj
@@ -21,8 +21,8 @@
   </PropertyGroup>
   <Import Project="..\build.DotNet.props" />
   <ItemGroup>
-    <PackageReference Include="System.Reactive.Core" Version="$(RxVersion)" />
-    <PackageReference Include="System.Reactive.Interfaces" Version="$(RxVersion)" />
+    <PackageReference Include="System.Reactive.Core" Version="$(SystemReactiveVersion)" />
+    <PackageReference Include="System.Reactive.Interfaces" Version="$(SystemReactiveVersion)" />
     <Reference Include="System" />
   </ItemGroup>
   <Import Project="..\xunit.DotNet.props" />
diff --git a/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.csproj b/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.csproj
index f430146..07f7c6a 100644
--- a/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.csproj
+++ b/lang/cs/Org.Apache.REEF.Network.Tests/Org.Apache.REEF.Network.Tests.csproj
@@ -1,4 +1,4 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
@@ -42,10 +42,10 @@
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Reactive.Core">
-      <HintPath>$(PackagesDir)\Rx-Core.$(RxVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
+      <HintPath>$(PackagesDir)\System.Reactive.Core.$(SystemReactiveVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
     </Reference>
     <Reference Include="System.Reactive.Interfaces">
-      <HintPath>$(PackagesDir)\Rx-Interfaces.$(RxVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+      <HintPath>$(PackagesDir)\System.Reactive.Interfaces.$(SystemReactiveVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
@@ -97,4 +97,4 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
   <Import Project="$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets" Condition="Exists('$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets')" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lang/cs/Org.Apache.REEF.Network.Tests/packages.config b/lang/cs/Org.Apache.REEF.Network.Tests/packages.config
index d43f872..581efe6 100644
--- a/lang/cs/Org.Apache.REEF.Network.Tests/packages.config
+++ b/lang/cs/Org.Apache.REEF.Network.Tests/packages.config
@@ -18,9 +18,9 @@
 under the License.
 -->
 <packages>
-  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
-  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
   <package id="StyleCop.MSBuild" version="4.7.49.1" targetFramework="net45" developmentDependency="true" />
+  <package id="System.Reactive.Core" version="3.1.1" targetFramework="net451" />
+  <package id="System.Reactive.Interfaces" version="3.1.1" targetFramework="net451" />
   <package id="xunit" version="2.1.0" targetFramework="net45" />
   <package id="xunit.abstractions" version="2.0.0" targetFramework="net45" />
   <package id="xunit.assert" version="2.1.0" targetFramework="net45" />
@@ -28,4 +28,4 @@
   <package id="xunit.extensibility.core" version="2.1.0" targetFramework="net45" />
   <package id="xunit.extensibility.execution" version="2.1.0" targetFramework="net45" />
   <package id="xunit.runner.visualstudio" version="2.1.0" targetFramework="net45" />
-</packages>
\ No newline at end of file
+</packages>
diff --git a/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.DotNet.csproj b/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.DotNet.csproj
index 29a4766..68dc57b 100644
--- a/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.DotNet.csproj
+++ b/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.DotNet.csproj
@@ -27,8 +27,8 @@
   <ItemGroup>
     <PackageReference Include="protobuf-net" Version="$(ProtobufVersion)" />
     <PackageReference Include="Microsoft.Hadoop.Avro" Version="$(AvroVersion)" />
-    <PackageReference Include="System.Reactive.Core" Version="$(RxVersion)" />
-    <PackageReference Include="System.Reactive.Interfaces" Version="$(RxVersion)" />
+    <PackageReference Include="System.Reactive.Core" Version="$(SystemReactiveVersion)" />
+    <PackageReference Include="System.Reactive.Interfaces" Version="$(SystemReactiveVersion)" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Runtime.Caching" />
diff --git a/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.csproj b/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.csproj
index 0beb953..9114d17 100644
--- a/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.csproj
+++ b/lang/cs/Org.Apache.REEF.Network/Org.Apache.REEF.Network.csproj
@@ -1,4 +1,4 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
@@ -36,14 +36,14 @@
     <Reference Include="protobuf-net">
       <HintPath>$(PackagesDir)\protobuf-net.$(ProtobufVersion)\lib\net40\protobuf-net.dll</HintPath>
     </Reference>
-    <Reference Include="System.Reactive.Core">
-      <HintPath>$(PackagesDir)\Rx-Core.$(RxVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="System.Reactive.Interfaces">
-      <HintPath>$(PackagesDir)\Rx-Interfaces.$(RxVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Reactive.Core">
+      <HintPath>$(PackagesDir)\System.Reactive.Core.$(SystemReactiveVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces">
+      <HintPath>$(PackagesDir)\System.Reactive.Interfaces.$(SystemReactiveVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+    </Reference>
     <Reference Include="System.Runtime.Caching" />
     <Reference Include="System.Runtime.Serialization" />
     <Reference Include="System.Xml" />
@@ -193,4 +193,4 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
   <Import Project="$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets" Condition="Exists('$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets')" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lang/cs/Org.Apache.REEF.Network/packages.config b/lang/cs/Org.Apache.REEF.Network/packages.config
index 0b76c0c..66ec02f 100644
--- a/lang/cs/Org.Apache.REEF.Network/packages.config
+++ b/lang/cs/Org.Apache.REEF.Network/packages.config
@@ -21,7 +21,7 @@
   <package id="Microsoft.Hadoop.Avro" version="1.5.6" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
   <package id="protobuf-net" version="2.0.0.668" targetFramework="net45" />
-  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
-  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
   <package id="StyleCop.MSBuild" version="4.7.49.1" targetFramework="net45" developmentDependency="true" />
-</packages>
\ No newline at end of file
+  <package id="System.Reactive.Core" version="3.1.1" targetFramework="net451" />
+  <package id="System.Reactive.Interfaces" version="3.1.1" targetFramework="net451" />
+</packages>
diff --git a/lang/cs/Org.Apache.REEF.Tests/Org.Apache.REEF.Tests.csproj b/lang/cs/Org.Apache.REEF.Tests/Org.Apache.REEF.Tests.csproj
index 270e28f..a4301b7 100644
--- a/lang/cs/Org.Apache.REEF.Tests/Org.Apache.REEF.Tests.csproj
+++ b/lang/cs/Org.Apache.REEF.Tests/Org.Apache.REEF.Tests.csproj
@@ -1,4 +1,4 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
@@ -62,10 +62,10 @@
     <Reference Include="System.Core" />
     <Reference Include="System.Data" />
     <Reference Include="System.Reactive.Core">
-      <HintPath>$(PackagesDir)\Rx-Core.$(RxVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
+      <HintPath>$(PackagesDir)\System.Reactive.Core.$(SystemReactiveVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
     </Reference>
     <Reference Include="System.Reactive.Interfaces">
-      <HintPath>$(PackagesDir)\Rx-Interfaces.$(RxVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+      <HintPath>$(PackagesDir)\System.Reactive.Interfaces.$(SystemReactiveVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
     </Reference>
     <Reference Include="System.Spatial, Version=5.6.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <HintPath>$(PackagesDir)\System.Spatial.5.6.4\lib\net40\System.Spatial.dll</HintPath>
@@ -244,4 +244,4 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
   <Import Project="$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets" Condition="Exists('$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets')" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lang/cs/Org.Apache.REEF.Tests/packages.config b/lang/cs/Org.Apache.REEF.Tests/packages.config
index 35db217..17f2443 100644
--- a/lang/cs/Org.Apache.REEF.Tests/packages.config
+++ b/lang/cs/Org.Apache.REEF.Tests/packages.config
@@ -24,9 +24,9 @@
   <package id="Microsoft.Data.Services.Client" version="5.6.4" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
   <package id="protobuf-net" version="2.0.0.668" targetFramework="net45" />
-  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
-  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
   <package id="StyleCop.MSBuild" version="4.7.49.1" targetFramework="net45" developmentDependency="true" />
+  <package id="System.Reactive.Core" version="3.1.1" targetFramework="net451" />
+  <package id="System.Reactive.Interfaces" version="3.1.1" targetFramework="net451" />
   <package id="System.Spatial" version="5.6.4" targetFramework="net45" />
   <package id="WindowsAzure.Storage" version="6.1.0" targetFramework="net45" />
   <package id="xunit" version="2.1.0" targetFramework="net45" />
diff --git a/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.DotNet.csproj b/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.DotNet.csproj
index 2e779fd..fb96f88 100644
--- a/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.DotNet.csproj
+++ b/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.DotNet.csproj
@@ -21,8 +21,8 @@
   </PropertyGroup>
   <Import Project="..\build.DotNet.props" />
   <ItemGroup>
-    <PackageReference Include="System.Reactive.Core" Version="$(RxVersion)" />
-    <PackageReference Include="System.Reactive.Interfaces" Version="$(RxVersion)" />
+    <PackageReference Include="System.Reactive.Core" Version="$(SystemReactiveVersion)" />
+    <PackageReference Include="System.Reactive.Interfaces" Version="$(SystemReactiveVersion)" />
   </ItemGroup>
   <Import Project="..\xunit.DotNet.props" />
   <ItemGroup>
diff --git a/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.csproj b/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.csproj
index 4249bbf..e9cb4c6 100644
--- a/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.csproj
+++ b/lang/cs/Org.Apache.REEF.Wake.Tests/Org.Apache.REEF.Wake.Tests.csproj
@@ -1,4 +1,4 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
@@ -37,10 +37,10 @@
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Reactive.Core">
-      <HintPath>$(PackagesDir)\Rx-Core.$(RxVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
+      <HintPath>$(PackagesDir)\System.Reactive.Core.$(SystemReactiveVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
     </Reference>
     <Reference Include="System.Reactive.Interfaces">
-      <HintPath>$(PackagesDir)\Rx-Interfaces.$(RxVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+      <HintPath>$(PackagesDir)\System.Reactive.Interfaces.$(SystemReactiveVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
@@ -78,4 +78,4 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
   <Import Project="$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets" Condition="Exists('$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets')" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lang/cs/Org.Apache.REEF.Wake.Tests/packages.config b/lang/cs/Org.Apache.REEF.Wake.Tests/packages.config
index d43f872..581efe6 100644
--- a/lang/cs/Org.Apache.REEF.Wake.Tests/packages.config
+++ b/lang/cs/Org.Apache.REEF.Wake.Tests/packages.config
@@ -18,9 +18,9 @@
 under the License.
 -->
 <packages>
-  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
-  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
   <package id="StyleCop.MSBuild" version="4.7.49.1" targetFramework="net45" developmentDependency="true" />
+  <package id="System.Reactive.Core" version="3.1.1" targetFramework="net451" />
+  <package id="System.Reactive.Interfaces" version="3.1.1" targetFramework="net451" />
   <package id="xunit" version="2.1.0" targetFramework="net45" />
   <package id="xunit.abstractions" version="2.0.0" targetFramework="net45" />
   <package id="xunit.assert" version="2.1.0" targetFramework="net45" />
@@ -28,4 +28,4 @@
   <package id="xunit.extensibility.core" version="2.1.0" targetFramework="net45" />
   <package id="xunit.extensibility.execution" version="2.1.0" targetFramework="net45" />
   <package id="xunit.runner.visualstudio" version="2.1.0" targetFramework="net45" />
-</packages>
\ No newline at end of file
+</packages>
diff --git a/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.DotNet.csproj b/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.DotNet.csproj
index b97dd6d..1028bb7 100644
--- a/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.DotNet.csproj
+++ b/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.DotNet.csproj
@@ -28,7 +28,7 @@
     <Reference Include="System.Xml" />
     <PackageReference Include="protobuf-net" Version="$(ProtobufVersion)" />
     <PackageReference Include="EnterpriseLibrary.TransientFaultHandling.Core" Version="$(TransientFaultHandlingVersion)" />
-    <PackageReference Include="System.Reactive.Interfaces" Version="$(RxVersion)" />
+    <PackageReference Include="System.Reactive.Interfaces" Version="$(SystemReactiveVersion)" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Org.Apache.REEF.Tang\Org.Apache.REEF.Tang.DotNet.csproj" />
diff --git a/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.csproj b/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.csproj
index f423cf3..a380400 100644
--- a/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.csproj
+++ b/lang/cs/Org.Apache.REEF.Wake/Org.Apache.REEF.Wake.csproj
@@ -1,4 +1,4 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
@@ -38,8 +38,12 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Reactive.Core">
+      <HintPath>$(PackagesDir)\System.Reactive.Core.$(SystemReactiveVersion)\lib\net45\System.Reactive.Core.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="System.Reactive.Interfaces">
-      <HintPath>$(PackagesDir)\Rx-Interfaces.$(RxVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+      <HintPath>$(PackagesDir)\System.Reactive.Interfaces.$(SystemReactiveVersion)\lib\net45\System.Reactive.Interfaces.dll</HintPath>
     </Reference>
     <Reference Include="System.Xml" />
   </ItemGroup>
@@ -202,4 +206,4 @@
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
   <Import Project="$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets" Condition="Exists('$(PackagesDir)\StyleCop.MSBuild.$(StyleCopVersion)\build\StyleCop.MSBuild.Targets')" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lang/cs/Org.Apache.REEF.Wake/packages.config b/lang/cs/Org.Apache.REEF.Wake/packages.config
index 899f2b2..e176d57 100644
--- a/lang/cs/Org.Apache.REEF.Wake/packages.config
+++ b/lang/cs/Org.Apache.REEF.Wake/packages.config
@@ -1,4 +1,4 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
@@ -19,8 +19,8 @@
 -->
 <packages>
   <package id="protobuf-net" version="2.0.0.668" targetFramework="net45" />
-  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
-  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
   <package id="StyleCop.MSBuild" version="4.7.49.1" targetFramework="net45" developmentDependency="true" />
+  <package id="System.Reactive.Core" version="3.1.1" targetFramework="net451" />
+  <package id="System.Reactive.Interfaces" version="3.1.1" targetFramework="net451" />
   <package id="TransientFaultHandling.Core" version="5.1.1209.1" targetFramework="net45" />
 </packages>
diff --git a/lang/cs/build.DotNet.props b/lang/cs/build.DotNet.props
index 642d841..7dd5d1d 100644
--- a/lang/cs/build.DotNet.props
+++ b/lang/cs/build.DotNet.props
@@ -41,10 +41,9 @@
     <NewtonsoftJsonVersion>10.0.1</NewtonsoftJsonVersion>
     <NSubstituteVersion>1.8.2.0</NSubstituteVersion>
     <ProtobufVersion>2.0.0.668</ProtobufVersion>
-    <RxVersion>2.2.5</RxVersion>
+    <SystemReactiveVersion>3.1.1</SystemReactiveVersion>
     <StyleCopVersion>4.7.49.1</StyleCopVersion>
     <TransientFaultHandlingVersion>1.0.0</TransientFaultHandlingVersion>
-    <RxVersion>3.0.0</RxVersion>
     <NSubstituteVersion>2.0.3</NSubstituteVersion>
     <WindowsAzureStorageVersion>8.1.3</WindowsAzureStorageVersion>
   </PropertyGroup>
diff --git a/lang/cs/build.props b/lang/cs/build.props
index f00867d..4506c17 100644
--- a/lang/cs/build.props
+++ b/lang/cs/build.props
@@ -70,7 +70,7 @@
     <AvroVersion>1.5.6</AvroVersion>
     <NewtonsoftJsonVersion>8.0.3</NewtonsoftJsonVersion>
     <ProtobufVersion>2.0.0.668</ProtobufVersion>
-    <RxVersion>2.2.5</RxVersion>
+    <SystemReactiveVersion>3.1.1</SystemReactiveVersion>
     <StyleCopVersion>4.7.49.1</StyleCopVersion>
     <NSubstituteVersion>1.8.2.0</NSubstituteVersion>
   </PropertyGroup>