diff --git a/build/common.props b/build/common.props
index 2a4d78c7b1..8b6e6fdd93 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/samples/DatabaseErrorPageSample/DatabaseErrorPageSample.csproj b/samples/DatabaseErrorPageSample/DatabaseErrorPageSample.csproj
index 3c1dde2196..87c30cb2d5 100644
--- a/samples/DatabaseErrorPageSample/DatabaseErrorPageSample.csproj
+++ b/samples/DatabaseErrorPageSample/DatabaseErrorPageSample.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>net451;netcoreapp1.1</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' != 'netcoreapp1.1' ">win7-x64</RuntimeIdentifier>
     <OutputType>Exe</OutputType>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/DeveloperExceptionPageSample/DeveloperExceptionPageSample.csproj b/samples/DeveloperExceptionPageSample/DeveloperExceptionPageSample.csproj
index efcb235944..97ecd949db 100644
--- a/samples/DeveloperExceptionPageSample/DeveloperExceptionPageSample.csproj
+++ b/samples/DeveloperExceptionPageSample/DeveloperExceptionPageSample.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>net451;netcoreapp1.1</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' != 'netcoreapp1.1' ">win7-x64</RuntimeIdentifier>
     <OutputType>Exe</OutputType>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/ElmPageSample/ElmPageSample.csproj b/samples/ElmPageSample/ElmPageSample.csproj
index 51b02ec454..7f1962f83c 100644
--- a/samples/ElmPageSample/ElmPageSample.csproj
+++ b/samples/ElmPageSample/ElmPageSample.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>net451;netcoreapp1.1</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' != 'netcoreapp1.1' ">win7-x64</RuntimeIdentifier>
     <OutputType>Exe</OutputType>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/ExceptionHandlerSample/ExceptionHandlerSample.csproj b/samples/ExceptionHandlerSample/ExceptionHandlerSample.csproj
index af5935ae41..413b3b34f2 100644
--- a/samples/ExceptionHandlerSample/ExceptionHandlerSample.csproj
+++ b/samples/ExceptionHandlerSample/ExceptionHandlerSample.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>net451;netcoreapp1.1</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' != 'netcoreapp1.1' ">win7-x64</RuntimeIdentifier>
     <OutputType>Exe</OutputType>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/MiddlewareAnalysisSample/MiddlewareAnalysisSample.csproj b/samples/MiddlewareAnalysisSample/MiddlewareAnalysisSample.csproj
index 20e8b2b914..ef905b560d 100644
--- a/samples/MiddlewareAnalysisSample/MiddlewareAnalysisSample.csproj
+++ b/samples/MiddlewareAnalysisSample/MiddlewareAnalysisSample.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>net451;netcoreapp1.1</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' != 'netcoreapp1.1' ">win7-x64</RuntimeIdentifier>
     <OutputType>Exe</OutputType>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/StatusCodePagesSample/StatusCodePagesSample.csproj b/samples/StatusCodePagesSample/StatusCodePagesSample.csproj
index efcb235944..97ecd949db 100644
--- a/samples/StatusCodePagesSample/StatusCodePagesSample.csproj
+++ b/samples/StatusCodePagesSample/StatusCodePagesSample.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>net451;netcoreapp1.1</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' != 'netcoreapp1.1' ">win7-x64</RuntimeIdentifier>
     <OutputType>Exe</OutputType>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/samples/WelcomePageSample/WelcomePageSample.csproj b/samples/WelcomePageSample/WelcomePageSample.csproj
index efcb235944..97ecd949db 100644
--- a/samples/WelcomePageSample/WelcomePageSample.csproj
+++ b/samples/WelcomePageSample/WelcomePageSample.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>net451;netcoreapp1.1</TargetFrameworks>
     <RuntimeIdentifier Condition=" '$(TargetFramework)' != 'netcoreapp1.1' ">win7-x64</RuntimeIdentifier>
     <OutputType>Exe</OutputType>
-    <NetCoreAppImplicitPackageVersion>1.2.0-*</NetCoreAppImplicitPackageVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/Microsoft.AspNetCore.Diagnostics/Microsoft.AspNetCore.Diagnostics.csproj b/src/Microsoft.AspNetCore.Diagnostics/Microsoft.AspNetCore.Diagnostics.csproj
index 7f430e5f07..94c67f3611 100644
--- a/src/Microsoft.AspNetCore.Diagnostics/Microsoft.AspNetCore.Diagnostics.csproj
+++ b/src/Microsoft.AspNetCore.Diagnostics/Microsoft.AspNetCore.Diagnostics.csproj
@@ -26,13 +26,13 @@
     <PackageReference Include="Microsoft.Extensions.StackTrace.Sources" Version="1.2.0-*" PrivateAssets="All"/>
     <PackageReference Include="Microsoft.Extensions.TaskCache.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)" />
     <DotNetCliToolReference Include="RazorPageGenerator" Version="1.1.0-*" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='netstandard1.3'">
-    <PackageReference Include="System.Diagnostics.StackTrace" Version="4.4.0-*" />
+    <PackageReference Include="System.Diagnostics.StackTrace" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Microsoft.AspNetCore.MiddlewareAnalysis/Microsoft.AspNetCore.MiddlewareAnalysis.csproj b/src/Microsoft.AspNetCore.MiddlewareAnalysis/Microsoft.AspNetCore.MiddlewareAnalysis.csproj
index 67f38ac7ff..755e8b1c42 100644
--- a/src/Microsoft.AspNetCore.MiddlewareAnalysis/Microsoft.AspNetCore.MiddlewareAnalysis.csproj
+++ b/src/Microsoft.AspNetCore.MiddlewareAnalysis/Microsoft.AspNetCore.MiddlewareAnalysis.csproj
@@ -13,7 +13,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Hosting.Abstractions" Version="1.2.0-*" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="1.2.0-*" />
-    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="4.4.0-*" />
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="$(CoreFxVersion)" />
   </ItemGroup>
 
 </Project>