diff --git a/build/common.props b/build/common.props
index 2abfaa7306..609f4070e8 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>
 
@@ -21,4 +20,4 @@
     <PackageReference Include="NETStandard.Library" Version="$(NetStandardImplicitPackageVersion)" />
   </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>
diff --git a/build/dependencies.props b/build/dependencies.props
new file mode 100644
index 0000000000..e704edaec0
--- /dev/null
+++ b/build/dependencies.props
@@ -0,0 +1,6 @@
+<Project>
+  <PropertyGroup>
+    <NetStandardImplicitPackageVersion>1.6.1</NetStandardImplicitPackageVersion>
+    <CoreFxVersion>4.3.0</CoreFxVersion>
+  </PropertyGroup>
+</Project>
diff --git a/src/Microsoft.AspNetCore.Server.HttpSys/Microsoft.AspNetCore.Server.HttpSys.csproj b/src/Microsoft.AspNetCore.Server.HttpSys/Microsoft.AspNetCore.Server.HttpSys.csproj
index 79b143c29b..33b9d8e595 100644
--- a/src/Microsoft.AspNetCore.Server.HttpSys/Microsoft.AspNetCore.Server.HttpSys.csproj
+++ b/src/Microsoft.AspNetCore.Server.HttpSys/Microsoft.AspNetCore.Server.HttpSys.csproj
@@ -15,7 +15,7 @@
     <PackageReference Include="Microsoft.Net.Http.Headers" Version="1.2.0-*" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
-    <PackageReference Include="System.Security.Principal.Windows" Version="4.4.0-*" />
-    <PackageReference Include="System.Threading.Overlapped" Version="4.4.0-*" />
+    <PackageReference Include="System.Security.Principal.Windows" Version="$(CoreFxVersion)" />
+    <PackageReference Include="System.Threading.Overlapped" Version="$(CoreFxVersion)" />
   </ItemGroup>
 </Project>
diff --git a/test/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests.csproj b/test/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests.csproj
index 2d77749960..1ac989e98c 100644
--- a/test/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests.csproj
+++ b/test/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests/Microsoft.AspNetCore.Server.HttpSys.FunctionalTests.csproj
@@ -17,8 +17,8 @@
     <Reference Include="System.Net.Http.WebRequest" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp1.1' ">
-    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="4.4.0-*" />
-    <PackageReference Include="System.Net.WebSockets.Client" Version="4.4.0-*" />
+    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="$(CoreFxVersion)" />
+    <PackageReference Include="System.Net.WebSockets.Client" Version="$(CoreFxVersion)" />
   </ItemGroup>
   <ItemGroup>
     <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />