dotnet · dsyme · Sep 25, 2017 · Sep 25, 2017 · Sep 25, 2017
diff --git a/fcs/FSharp.Compiler.Service.Tests/App.config b/fcs/FSharp.Compiler.Service.Tests/App.config
@@ -7,6 +7,10 @@
         <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
         <bindingRedirect oldVersion="2.0.0.0-4.4.0.0" newVersion="4.4.1.0" />
       </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+        <bindingRedirect oldVersion="1.0.0.0-1.2.0.0" newVersion="1.2.1.0" />
+      </dependentAssembly>
     </assemblyBinding>
   </runtime>
   <startup>

diff --git a/fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj b/fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj
@@ -100,7 +100,7 @@
 
   <ItemGroup>
     <Reference Include="System.Collections.Immutable">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="nunit.framework">

diff --git a/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj b/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj
@@ -626,7 +626,7 @@
       <HintPath>$(FSharpSourcesRoot)\..\packages\System.Reflection.Metadata.1.4.2\lib\portable-net45+win8\System.Reflection.Metadata.dll</HintPath>
     </Reference>
     <Reference Include="System.Collections.Immutable">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.3.1\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
     </Reference>
     <Reference Include="System.ValueTuple">
       <HintPath>$(FSharpSourcesRoot)\..\packages\System.ValueTuple.4.3.1\lib\netstandard1.0\System.ValueTuple.dll</HintPath>

diff --git a/fcs/docsrc/content/corelib.fsx b/fcs/docsrc/content/corelib.fsx
@@ -19,19 +19,25 @@ an FSharp.Core.optdata and FSharp.Core.sigdata, see below for guidance.
 Binding redirects for your application
 --------------------------------------
 
-The FSharp.Compiler.Service.dll component depends on FSharp.Core 4.3.0.0.  Normally your application will target
+The FSharp.Compiler.Service.dll component depends on FSharp.Core 4.4.0.0.  Normally your application will target
 a later version of FSharp.Core, and you will need a [binding redirect](http://msdn.microsoft.com/en-us/library/7wd6ex19(v=vs.110).aspx) to ensure
-that FSharp.Core 4.3.0.0 forwards to which the final version of FSharp.Core.dll your application uses.
+that other versions of FSharp.Core forward to the final version of FSharp.Core.dll your application uses.
 Binding redirect files are normally generated automatically by build tools. If not, you can use one like this
 (if your tool is called ``HostedCompiler.exe``, the binding redirect file is called ``HostedCompiler.exe.config``)
 
+Some other dependencies may also need to be reconciled and forwarded.
+
     <?xml version="1.0" encoding="utf-8" ?>
     <configuration>
         <runtime>
           <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
             <dependentAssembly>
               <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
-              <bindingRedirect oldVersion="2.0.0.0-4.3.0.0" newVersion="4.3.1.0"/>
+              <bindingRedirect oldVersion="2.0.0.0-4.4.0.0" newVersion="4.4.1.0"/>
+            </dependentAssembly>
+            <dependentAssembly>
+              <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+              <bindingRedirect oldVersion="1.0.0.0-1.2.0.0" newVersion="1.2.1.0" />
             </dependentAssembly>
           </assemblyBinding>
         </runtime>	

diff --git a/fcs/docsrc/content/ja/corelib.fsx b/fcs/docsrc/content/ja/corelib.fsx
@@ -26,6 +26,10 @@ FSharp.Compiler.Service.dll コンポーネントは FSharp.Core 4.3.0.0 に依
               <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
               <bindingRedirect oldVersion="2.0.0.0-4.3.0.0" newVersion="4.3.1.0"/>
             </dependentAssembly>
+            <dependentAssembly>
+              <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+              <bindingRedirect oldVersion="1.0.0.0-1.2.0.0" newVersion="1.2.1.0" />
+            </dependentAssembly>
           </assemblyBinding>
         </runtime>	
     </configuration>

diff --git a/fcs/nuget/FSharp.Compiler.Service.nuspec b/fcs/nuget/FSharp.Compiler.Service.nuspec
@@ -19,7 +19,7 @@
         <summary>F# compiler services for creating IDE tools, language extensions and for F# embedding.</summary>
         <dependencies>
             <group targetFramework="net45">
-                <dependency id="System.Collections.Immutable" version="1.2.0" />
+                <dependency id="System.Collections.Immutable" version="1.3.1" />
                 <dependency id="System.Reflection.Metadata" version="1.4.2" />
             </group>
         </dependencies>

diff --git a/fcs/samples/EditorService/App.config b/fcs/samples/EditorService/App.config
@@ -7,15 +7,7 @@
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>
         <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
-        <bindingRedirect oldVersion="2.0.0.0" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="2.3.0.0" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="2.3.5.0" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="4.0.0.0" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="4.3.0.0" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="3.3.1.0" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="2.3.5.1" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="3.78.3.1" newVersion="4.3.1.0" />
-        <bindingRedirect oldVersion="3.259.3.1" newVersion="4.3.1.0" />
+        <bindingRedirect oldVersion="2.0.0.0-4.4.0.0" newVersion="4.4.1.0" />
       </dependentAssembly>
     </assemblyBinding>
   </runtime>

diff --git a/fcs/samples/EditorService/EditorService.fsproj b/fcs/samples/EditorService/EditorService.fsproj
@@ -12,7 +12,6 @@
     <AssemblyName>EditorService</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <Name>EditorService</Name>
-    <TargetFSharpCoreVersion>4.4.0.0</TargetFSharpCoreVersion>
     <TargetFrameworkProfile />
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>

diff --git a/packages.config b/packages.config
@@ -12,7 +12,7 @@
   <package id="MicroBuild.Core.Sentinel" version="1.0.0" />
 
   <!-- Actual dependencies of FSharp.Compiler.dll and FSharp.Core.dll -->
-  <package id="System.Collections.Immutable" version="1.2.0" />
+  <package id="System.Collections.Immutable" version="1.3.1" />
   <package id="System.Reflection.Metadata" version="1.4.2" />
   <package id="Microsoft.DiaSymReader.PortablePdb" version="1.1.0"  />
   <package id="Microsoft.DiaSymReader" version="1.1.0" />

diff --git a/setup/FSharp.SDK/component-groups/Compiler_Redist.wxs b/setup/FSharp.SDK/component-groups/Compiler_Redist.wxs
@@ -171,7 +171,7 @@
       </Component>
 
       <Component Id="Compiler_Redist_System.Collections.Immutable.dll" Guid="$(fsharp.guid(Compiler_Redist_System.Collections.Immutable.dll, $(var.LocaleCode)))">
-        <File Id="Compiler_Redist_System.Collections.Immutable.dll" Source="$(var.NugetPackagesDir)\System.Collections.Immutable.1.2.0\lib\netstandard1.0\System.Collections.Immutable.dll" />
+        <File Id="Compiler_Redist_System.Collections.Immutable.dll" Source="$(var.NugetPackagesDir)\System.Collections.Immutable.1.3.1\lib\netstandard1.0\System.Collections.Immutable.dll" />
       </Component>
 
       <Component Id="Compiler_Redist_System.Reflection.Metadata.dll" Guid="$(fsharp.guid(Compiler_Redist_System.Reflection.Metadata.dll, $(var.LocaleCode)))">

diff --git a/setup/packages.config b/setup/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="System.Collections.Immutable" version="1.2.0" />
+  <package id="System.Collections.Immutable" version="1.3.1" />
   <package id="System.Reflection.Metadata" version="1.4.1-beta-24227-04" />
   <package id="Microsoft.DiaSymReader.PortablePdb" version="1.1.0"  />
   <package id="Microsoft.DiaSymReader" version="1.0.8" />

diff --git a/src/FSharpSource.Settings.targets b/src/FSharpSource.Settings.targets
@@ -35,6 +35,7 @@
     <RoslynVersion>2.3.0-beta2-61719-01</RoslynVersion>
     <RoslynVSBinariesVersion>15.0</RoslynVSBinariesVersion>
     <RoslynVSPackagesVersion>15.0.26201</RoslynVSPackagesVersion>
+    <SystemCollectionsImmutableVersion>1.3.1</SystemCollectionsImmutableVersion>
     <VSSDK_BUILDTOOLS_VERSION>Microsoft.VSSDK.BuildTools.15.0.26201</VSSDK_BUILDTOOLS_VERSION>
 
     <MicrosoftVisualStudioThreadingVersion>15.3.23</MicrosoftVisualStudioThreadingVersion>

diff --git a/src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.BuildFromSource.fsproj b/src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.BuildFromSource.fsproj
@@ -608,7 +608,7 @@
   <Import Project = "$(MSBuildThisFileDirectory)../../FSharpSource.BuildFromSource.targets" />
 
 <!--
-    "System.Collections.Immutable":"1.2.0",
+    "System.Collections.Immutable":"1.3.1",
     "System.Diagnostics.Process": "4.3.0",
     "System.Diagnostics.TraceSource": "4.3.0",
     "System.Linq.Expressions": "4.3.0",
@@ -630,7 +630,7 @@
 -->
   <ItemGroup>
     <ProjectReference Include="$(MSBuildThisFileDirectory)..\FSharp.Core\FSharp.Core.BuildFromSource.fsproj" />
-    <PackageReference Include="System.Collections.Immutable" Version="1.2.0"></PackageReference>
+    <PackageReference Include="System.Collections.Immutable" Version="1.3.1"></PackageReference>
     <PackageReference Include="System.Diagnostics.Process" Version="4.3.0"></PackageReference>
     <PackageReference Include="System.Diagnostics.TraceSource" Version="4.3.0"></PackageReference>
     <PackageReference Include="System.Linq.Expressions" Version="4.3.0"></PackageReference>

diff --git a/src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.fsproj b/src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.fsproj
@@ -663,7 +663,7 @@
       <HintPath>..\..\..\packages\System.Reflection.Metadata.1.4.2\lib\portable-net45+win8\System.Reflection.Metadata.dll</HintPath>
     </Reference>
     <Reference Include="System.Collections.Immutable">
-      <HintPath>..\..\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+      <HintPath>..\..\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
     </Reference>
     <Reference Include="System.ValueTuple">
       <HintPath>..\..\..\packages\System.ValueTuple.4.3.1\lib\netstandard1.0\System.ValueTuple.dll</HintPath>

diff --git a/src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.netcore.nuspec b/src/fsharp/FSharp.Compiler.Private/FSharp.Compiler.Private.netcore.nuspec
@@ -16,7 +16,7 @@
         <dependencies>
             <group>
                 <dependency id="NETStandard.Library" version="1.6.0" />
-                <dependency id="System.Collections.Immutable" version="1.2.0" />
+                <dependency id="System.Collections.Immutable" version="1.3.1" />
                 <dependency id="System.Diagnostics.Process" version="4.1.0" />
                 <dependency id="System.Diagnostics.TraceSource" version="4.0.0" />
                 <dependency id="System.Linq.Expressions" version="4.1.0" />

diff --git a/src/fsharp/FSharp.Compiler.Private/project.json b/src/fsharp/FSharp.Compiler.Private/project.json
@@ -1,7 +1,7 @@
 {
   "dependencies": {
     "NETStandard.Library": "1.6.1",
-    "System.Collections.Immutable":"1.2.0",
+    "System.Collections.Immutable":"1.3.1",
     "System.Diagnostics.Process": "4.3.0",
     "System.Diagnostics.TraceSource": "4.3.0",
     "System.Linq.Expressions": "4.3.0",

diff --git a/src/fsharp/FSharp.Compiler.nuget/Microsoft.FSharp.Compiler.nuspec b/src/fsharp/FSharp.Compiler.nuget/Microsoft.FSharp.Compiler.nuspec
@@ -17,7 +17,7 @@
             <group targetFramework=".NETStandard1.6">
                 <dependency id="Microsoft.NETCore.Platforms" version="1.0.1" />
                 <dependency id="NETStandard.Library" version="1.6.0" />
-                <dependency id="System.Collections.Immutable" version="1.2.0" />
+                <dependency id="System.Collections.Immutable" version="1.3.1" />
                 <dependency id="System.Console" version="4.0.0" />
                 <dependency id="System.Diagnostics.Process" version="4.1.0" />
                 <dependency id="System.Diagnostics.TraceSource" version="4.0.0" />

diff --git a/src/fsharp/FSharp.Compiler.nuget/Testing.FSharp.Compiler.nuspec b/src/fsharp/FSharp.Compiler.nuget/Testing.FSharp.Compiler.nuspec
@@ -16,7 +16,7 @@
             <group targetFramework=".NETStandard1.6">
                 <dependency id="Microsoft.NETCore.Platforms" version="1.0.1" />
                 <dependency id="NETStandard.Library" version="1.6.0" />
-                <dependency id="System.Collections.Immutable" version="1.2.0" />
+                <dependency id="System.Collections.Immutable" version="1.3.1" />
                 <dependency id="System.Console" version="4.0.0" />
                 <dependency id="System.Diagnostics.Process" version="4.1.0" />
                 <dependency id="System.Diagnostics.TraceSource" version="4.0.0" />

diff --git a/src/fsharp/Fsc-proto/Fsc-proto.fsproj b/src/fsharp/Fsc-proto/Fsc-proto.fsproj
@@ -465,7 +465,7 @@
       <HintPath>$(FSharpSourcesRoot)\..\packages\System.Reflection.Metadata.1.4.2\lib\portable-net45+win8\System.Reflection.Metadata.dll</HintPath>
     </Reference>
     <Reference Include="System.Collections.Immutable">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
     </Reference>
     <Reference Include="System.ValueTuple">
       <HintPath>$(FSharpSourcesRoot)\..\packages\System.ValueTuple.4.3.1\lib\netstandard1.0\System.ValueTuple.dll</HintPath>

diff --git a/src/fsharp/Fsc-proto/fsc-proto.exe.config b/src/fsharp/Fsc-proto/fsc-proto.exe.config
@@ -1,5 +1,11 @@
 <configuration>
    <runtime>
       <gcServer enabled="true"/>
+      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+        <dependentAssembly>
+          <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+          <bindingRedirect oldVersion="1.0.0.0-1.2.0.0" newVersion="1.2.1.0" />
+        </dependentAssembly>
+      </assemblyBinding>
    </runtime>
 </configuration>
diff --git a/src/fsharp/Fsc/fsc.exe.config b/src/fsharp/Fsc/fsc.exe.config
@@ -8,6 +8,10 @@
         <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
         <bindingRedirect oldVersion="2.0.0.0-4.4.1.0" newVersion="4.4.1.0"/>
       </dependentAssembly>
+        <dependentAssembly>
+          <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+          <bindingRedirect oldVersion="1.0.0.0-1.2.0.0" newVersion="1.2.1.0" />
+        </dependentAssembly>
     </assemblyBinding>
   </runtime>
 </configuration>
diff --git a/src/fsharp/fsi/fsi.exe.config b/src/fsharp/fsi/fsi.exe.config
@@ -7,6 +7,10 @@
         <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
         <bindingRedirect oldVersion="2.0.0.0-4.4.1.0" newVersion="4.4.1.0"/>
       </dependentAssembly>
+        <dependentAssembly>
+          <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+          <bindingRedirect oldVersion="1.0.0.0-1.2.0.0" newVersion="1.2.1.0" />
+        </dependentAssembly>
     </assemblyBinding>
   </runtime>
 </configuration>
diff --git a/src/fsharp/fsi/fsiAnyCpu.exe.config b/src/fsharp/fsi/fsiAnyCpu.exe.config
@@ -8,6 +8,10 @@
         <assemblyIdentity name="FSharp.Core" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
         <bindingRedirect oldVersion="2.0.0.0-4.4.1.0" newVersion="4.4.1.0"/>
       </dependentAssembly>
+        <dependentAssembly>
+          <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
+          <bindingRedirect oldVersion="1.0.0.0-1.2.0.0" newVersion="1.2.1.0" />
+        </dependentAssembly>
     </assemblyBinding>
   </runtime>
 </configuration>
diff --git a/vsintegration/Vsix/VisualFSharpFull/VisualFSharpFull.csproj b/vsintegration/Vsix/VisualFSharpFull/VisualFSharpFull.csproj
@@ -325,11 +325,6 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>$(FSharpSourcesRoot)\..\packages\Newtonsoft.Json.10.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
-    <!-- Microsoft.CodeAnalysis.Features requires 1.2.1 but the rest of F# uses 1.2.0 -->
-    <!-- If we don't get the version right here the wrong version is copied during the build  -->
-    <Reference Include="System.Collections.Immutable, Version=1.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
-    </Reference>
   </ItemGroup>
   <Import Project="$(FSharpSourcesRoot)\..\vsintegration\src\FSharp.tools.targets" />
   <Import Project="$(FSharpSourcesRoot)\Microbuild.Settings.targets" />

diff --git a/vsintegration/Vsix/VisualFSharpOpenSource/VisualFSharpOpenSource.csproj b/vsintegration/Vsix/VisualFSharpOpenSource/VisualFSharpOpenSource.csproj
@@ -324,10 +324,8 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>$(FSharpSourcesRoot)\..\packages\Newtonsoft.Json.10.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
-    <!-- Microsoft.CodeAnalysis.Features requires 1.2.1 but the rest of F# uses 1.2.0 -->
-    <!-- If we don't get the version right here the wrong version is copied during the build  -->
-    <Reference Include="System.Collections.Immutable, Version=1.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+    <Reference Include="System.Collections.Immutable, Version=1.3.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
     </Reference>
   </ItemGroup>
   <Import Project="$(FSharpSourcesRoot)\..\vsintegration\src\FSharp.tools.targets" />

diff --git a/vsintegration/src/FSharp.Editor/FSharp.Editor.fsproj b/vsintegration/src/FSharp.Editor/FSharp.Editor.fsproj
@@ -268,7 +268,7 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Collections.Immutable">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="Newtonsoft.Json">

diff --git a/vsintegration/src/FSharp.LanguageService.Base/FSharp.LanguageService.Base.csproj b/vsintegration/src/FSharp.LanguageService.Base/FSharp.LanguageService.Base.csproj
@@ -178,7 +178,7 @@
       <HintPath>$(FSharpSourcesRoot)\..\packages\Microsoft.VisualStudio.ComponentModelHost.15.0.26201-alpha\lib\net46\Microsoft.VisualStudio.ComponentModelHost.dll</HintPath>
     </Reference>
     <Reference Include="System.Collections.Immutable">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <ProjectReference Include="$(FSharpSourcesRoot)\fsharp\FSharp.Core\FSharp.Core.fsproj">

diff --git a/vsintegration/src/FSharp.LanguageService/FSharp.LanguageService.fsproj b/vsintegration/src/FSharp.LanguageService/FSharp.LanguageService.fsproj
@@ -239,7 +239,7 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Collections.Immutable">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.$(SystemCollectionsImmutableVersion)\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
       <Private>True</Private>
     </Reference>
   </ItemGroup>

diff --git a/vsintegration/src/FSharp.ProjectSystem.FSharp/ProjectSystem.fsproj b/vsintegration/src/FSharp.ProjectSystem.FSharp/ProjectSystem.fsproj
@@ -211,10 +211,8 @@
     <Reference Include="Microsoft.VisualStudio.Shell.$(RoslynVSBinariesVersion), Version=$(RoslynVSBinariesVersion).0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
       <HintPath>$(FSharpSourcesRoot)\..\packages\Microsoft.VisualStudio.Shell.$(RoslynVSBinariesVersion).$(RoslynVSPackagesVersion)\lib\Microsoft.VisualStudio.Shell.$(RoslynVSBinariesVersion).dll</HintPath>
     </Reference>
-    <!-- Microsoft.CodeAnalysis.Features requires 1.2.1 but the rest of F# uses 1.2.0 -->
-    <!-- If we don't get the version right here the wrong version is copied during the build  -->
-    <Reference Include="System.Collections.Immutable, Version=1.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <HintPath>$(FSharpSourcesRoot)\..\packages\System.Collections.Immutable.1.2.0\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
+    <Reference Include="System.Collections.Immutable, Version=1.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
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