diff --git a/build/common.props b/build/common.props
index 6ebfd4dc51..d9170e6bbb 100644
--- a/build/common.props
+++ b/build/common.props
@@ -1,4 +1,5 @@
 <Project>
+  <Import Project="dependencies.props" />
   <Import Project="..\version.props" />
 
   <PropertyGroup>
@@ -8,8 +9,6 @@
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)Key.snk</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>
     <PublicSign Condition="'$(OS)' != 'Windows_NT'">true</PublicSign>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
-    <NetStandardImplicitPackageVersion>1.6.2-*</NetStandardImplicitPackageVersion>
     <VersionSuffix Condition="'$(VersionSuffix)'!='' AND '$(BuildNumber)' != ''">$(VersionSuffix)-$(BuildNumber)</VersionSuffix>
   </PropertyGroup>
 
diff --git a/build/dependencies.props b/build/dependencies.props
new file mode 100644
index 0000000000..4757dc6c19
--- /dev/null
+++ b/build/dependencies.props
@@ -0,0 +1,7 @@
+<Project>
+  <PropertyGroup>
+    <NetStandardImplicitPackageVersion>1.6.1</NetStandardImplicitPackageVersion>
+    <CoreFxVersion>4.3.0</CoreFxVersion>
+    <SystemReflectionMetadataVersion>1.4.2</SystemReflectionMetadataVersion>
+  </PropertyGroup>
+</Project>
diff --git a/src/Microsoft.AspNetCore.Hosting/Microsoft.AspNetCore.Hosting.csproj b/src/Microsoft.AspNetCore.Hosting/Microsoft.AspNetCore.Hosting.csproj
index 04f493c22c..39f4cea5d0 100644
--- a/src/Microsoft.AspNetCore.Hosting/Microsoft.AspNetCore.Hosting.csproj
+++ b/src/Microsoft.AspNetCore.Hosting/Microsoft.AspNetCore.Hosting.csproj
@@ -26,16 +26,16 @@
     <PackageReference Include="Microsoft.Extensions.RuntimeEnvironment.Sources" Version="1.2.0-*" PrivateAssets="All"/>
     <PackageReference Include="Microsoft.Extensions.StackTrace.Sources" Version="1.2.0-*" PrivateAssets="All"/>
     <PackageReference Include="Microsoft.Extensions.TypeNameHelper.Sources" Version="1.2.0-*" PrivateAssets="All"/>
-    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="4.4.0-*" />
-    <PackageReference Include="System.Reflection.Metadata" Version="1.5.0-*" />
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="$(CoreFxVersion)" />
+    <PackageReference Include="System.Reflection.Metadata" Version="$(SystemReflectionMetadataVersion)" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' != 'net451'">
-    <PackageReference Include="System.Diagnostics.StackTrace" Version="4.4.0-*" />
+    <PackageReference Include="System.Diagnostics.StackTrace" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.5' ">
-    <PackageReference Include="System.Runtime.Loader" Version="4.4.0-*" />
+    <PackageReference Include="System.Runtime.Loader" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Microsoft.AspNetCore.Server.IntegrationTesting/Microsoft.AspNetCore.Server.IntegrationTesting.csproj b/src/Microsoft.AspNetCore.Server.IntegrationTesting/Microsoft.AspNetCore.Server.IntegrationTesting.csproj
index 5464f8659c..e16210bfbe 100644
--- a/src/Microsoft.AspNetCore.Server.IntegrationTesting/Microsoft.AspNetCore.Server.IntegrationTesting.csproj
+++ b/src/Microsoft.AspNetCore.Server.IntegrationTesting/Microsoft.AspNetCore.Server.IntegrationTesting.csproj
@@ -33,8 +33,8 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
-    <PackageReference Include="System.Diagnostics.Process" Version="4.4.0-*" />
-    <PackageReference Include="System.Threading.Thread" Version="4.4.0-*" />
+    <PackageReference Include="System.Diagnostics.Process" Version="$(CoreFxVersion)" />
+    <PackageReference Include="System.Threading.Thread" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Microsoft.AspNetCore.TestHost/Microsoft.AspNetCore.TestHost.csproj b/src/Microsoft.AspNetCore.TestHost/Microsoft.AspNetCore.TestHost.csproj
index cc3dccbefb..fbd1cde469 100644
--- a/src/Microsoft.AspNetCore.TestHost/Microsoft.AspNetCore.TestHost.csproj
+++ b/src/Microsoft.AspNetCore.TestHost/Microsoft.AspNetCore.TestHost.csproj
@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
-    <PackageReference Include="System.Diagnostics.Contracts" Version="4.4.0-*" />
+    <PackageReference Include="System.Diagnostics.Contracts" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
 </Project>