diff --git a/Example/Example.csproj b/Example/Example.csproj
index 8884d185e..277b38756 100644
--- a/Example/Example.csproj
+++ b/Example/Example.csproj
@@ -34,6 +34,9 @@
       <HintPath>..\packages\NStack.Core.0.14.0\lib\netstandard2.0\NStack.dll</HintPath>
     </Reference>
     <Reference Include="System" />
+    <Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.ValueTuple.4.5.0\lib\net461\System.ValueTuple.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="demo.cs" />
diff --git a/Example/packages.config b/Example/packages.config
index e9a5eef4e..1a843af98 100644
--- a/Example/packages.config
+++ b/Example/packages.config
@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="NStack.Core" version="0.14.0" targetFramework="net461" />
+  <package id="System.ValueTuple" version="4.5.0" targetFramework="net461" />
 </packages>
\ No newline at end of file