diff --git a/build/dependencies.props b/build/dependencies.props
index d7c3dbfed1..e3c4edf15c 100644
--- a/build/dependencies.props
+++ b/build/dependencies.props
@@ -28,7 +28,6 @@
   <!-- .NET Core feed -->
   <PropertyGroup>
     <DotNetCoreFeed>https://dotnet.myget.org/F/dotnet-core/api/v3/index.json</DotNetCoreFeed>
-    <CoreFxVersion>4.5.0-preview1-25902-08</CoreFxVersion>
     <CoreSetupPackageVersion>2.1.0-preview1-25907-02</CoreSetupPackageVersion>
   </PropertyGroup>
 
@@ -43,7 +42,7 @@
     <ExternalDependency Include="Microsoft.NETCore.DotNetAppHost" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="Microsoft.NETCore.DotNetHostPolicy" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="Microsoft.NETCore.DotNetHostResolver" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
-    <ExternalDependency Include="Microsoft.NETCore.Platforms" Version="2.1.0-preview1-25831-01" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="Microsoft.NETCore.Platforms" Version="2.1.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="runtime.win-x86.Microsoft.NETCore.App" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="runtime.win-x86.Microsoft.NETCore.DotNetAppHost" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="runtime.win-x86.Microsoft.NETCore.DotNetHost" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
@@ -69,10 +68,10 @@
     <ExternalDependency Include="runtime.linux-x64.Microsoft.NETCore.DotNetHost" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="runtime.linux-x64.Microsoft.NETCore.DotNetHostPolicy" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="runtime.linux-x64.Microsoft.NETCore.DotNetHostResolver" Version="$(CoreSetupPackageVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
-    <ExternalDependency Include="System.Memory" Version="$(CoreFxVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
-    <ExternalDependency Include="System.Numerics.Vectors" Version="$(CoreFxVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
-    <ExternalDependency Include="System.Runtime.CompilerServices.Unsafe" Version="$(CoreFxVersion)" Source="$(DotNetCoreFeed)" Mirror="true" />
-    <ExternalDependency Include="System.Threading.Channels" Version="$(CoreFxVersion)" Source="$(DotNetCoreFeed)" Private="true" Mirror="true" />
+    <ExternalDependency Include="System.Memory" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Numerics.Vectors" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Threading.Channels" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Private="true" Mirror="true" />
   </ItemGroup>
 
   <!-- CoreFX labs -->
@@ -243,7 +242,7 @@
       <NoWarn>KRB2004</NoWarn>
     </ExternalDependency>
 
-    <ExternalDependency Include="Microsoft.CSharp" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="Microsoft.CSharp" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="Microsoft.Extensions.PlatformAbstractions" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.IdentityModel.Clients.ActiveDirectory" Version="3.14.1" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="5.2.0-preview2-41113220915" Source="$(DefaultNuGetFeed)" />
@@ -268,7 +267,7 @@
     <ExternalDependency Include="Microsoft.Owin.Security.Cookies" Version="3.0.1" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.Owin.Security" Version="3.0.1" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.Owin.Testing" Version="3.0.1" Source="$(DefaultNuGetFeed)" Private="true" />
-    <ExternalDependency Include="Microsoft.Owin" Version="3.0.1" Source="$(DefaultNuGetFeed)"/>
+    <ExternalDependency Include="Microsoft.Owin" Version="3.0.1" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.VisualStudio.ComponentModelHost" Version="15.0.26606" Source="$(DefaultNuGetFeed)" Private="true" />
     <ExternalDependency Include="Microsoft.VisualStudio.Editor" Version="15.0.26606" Source="$(DefaultNuGetFeed)" Private="true" />
     <ExternalDependency Include="Microsoft.VisualStudio.Language.Intellisense" Version="15.0.26606" Source="$(DefaultNuGetFeed)" Private="true" />
@@ -288,7 +287,7 @@
     <ExternalDependency Include="Microsoft.VisualStudio.Text.UI" Version="15.0.26606" Source="$(DefaultNuGetFeed)" Private="true" />
     <ExternalDependency Include="Microsoft.Web.Administration" Version="7.0.0" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.Web.Xdt" Version="1.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="Microsoft.Win32.Registry" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="Microsoft.Win32.Registry" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="Mono.Addins" Version="1.3.7" Source="$(DefaultNuGetFeed)" Private="true" />
     <ExternalDependency Include="Moq" Version="4.7.49" Source="$(DefaultNuGetFeed)" Private="true" />
     <ExternalDependency Include="MsgPack.Cli" Version="0.9.0-beta2" Source="$(DefaultNuGetFeed)" />
@@ -332,56 +331,56 @@
     <ExternalDependency Include="StackExchange.Redis.StrongName" Version="1.2.4" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="StreamJsonRpc" Version="1.1.92" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="StyleCop.Analyzers" Version="1.0.0" Source="$(DefaultNuGetFeed)" Private="true" />
-    <ExternalDependency Include="System.Buffers" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.CodeDom" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Collections.Immutable" Version="1.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.ComponentModel.Annotations" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Composition.AttributedModel" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Composition.Convention" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Composition.Hosting" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Composition.Runtime" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Composition.TypedParts" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Composition" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Configuration.ConfigurationManager" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="System.Buffers" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.CodeDom" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Collections.Immutable" Version="1.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.ComponentModel.Annotations" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Composition.AttributedModel" Version="1.2.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Composition.Convention" Version="1.2.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Composition.Hosting" Version="1.2.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Composition.Runtime" Version="1.2.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Composition.TypedParts" Version="1.2.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Composition" Version="1.2.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Configuration.ConfigurationManager" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="System.Data.SqlClient" Version="4.3.1" Source="$(DefaultNuGetFeed)" Private="true">
       <!-- This version is used by EF's 1.1 benchmark project -->
       <NoWarn>KRB2004</NoWarn>
       <VariableName>Benchmarks_11_SystemDataSqlClientPackageVersion</VariableName>
     </ExternalDependency>
-    <ExternalDependency Include="System.Data.SqlClient" Version="4.4.0" Source="$(DefaultNuGetFeed)">
+    <ExternalDependency Include="System.Data.SqlClient" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true">
       <!-- This version should be used by runtime packages. -->
       <NoWarn>KRB2004</NoWarn>
     </ExternalDependency>
-    <ExternalDependency Include="System.Diagnostics.DiagnosticSource" Version="4.4.1" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="System.Diagnostics.DiagnosticSource" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="System.Interactive.Async" Version="3.1.1" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.IO.FileSystem.AccessControl" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.IO.Packaging" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.IO.Pipes.AccessControl" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.IO.Ports" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Json" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="System.IO.FileSystem.AccessControl" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.IO.Packaging" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.IO.Pipes.AccessControl" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.IO.Ports" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Json" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="System.Management.Automation" Version="6.1.7601.17515" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Net.Http.WinHttpHandler" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="System.Net.Http.WinHttpHandler" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="System.Net.Http" Version="4.3.2" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="System.Reactive.Linq" Version="3.1.1" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Reflection.DispatchProxy" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="System.Reflection.DispatchProxy" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="System.Reflection.Emit" Version="4.3.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Reflection.Metadata" Version="1.5.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Reflection.TypeExtensions" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="System.Reflection.Metadata" Version="1.6.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Reflection.TypeExtensions" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Security.AccessControl" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Security.Cryptography.Cng" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Security.Cryptography.Pkcs" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Security.Cryptography.ProtectedData" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Security.Cryptography.Xml" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Security.Permissions" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Security.Principal.Windows" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.ServiceProcess.ServiceController" Version="4.5.0-preview1-25914-04" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Text.Encoding.CodePages" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Text.Encodings.Web" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Threading.AccessControl" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Threading.Tasks.Dataflow" Version="4.8.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.Threading.Tasks.Extensions" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="System.ValueTuple" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="System.Security.AccessControl" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Security.Cryptography.Cng" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Security.Cryptography.Pkcs" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Security.Cryptography.ProtectedData" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Security.Cryptography.Xml" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Security.Permissions" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Security.Principal.Windows" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.ServiceProcess.ServiceController" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Text.Encoding.CodePages" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Text.Encodings.Web" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Threading.AccessControl" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Threading.Tasks.Dataflow" Version="4.9.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.Threading.Tasks.Extensions" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
+    <ExternalDependency Include="System.ValueTuple" Version="4.5.0-preview1-25922-03" Source="$(DotNetCoreFeed)" Mirror="true" />
     <ExternalDependency Include="WindowsAzure.Storage" Version="8.1.4" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="xunit.abstractions" Version="2.0.1" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="xunit.analyzers" Version="0.7.0" Source="$(DefaultNuGetFeed)" />