diff --git a/tests/ImageSharp.Sandbox46/ImageSharp.Sandbox46.csproj b/tests/ImageSharp.Sandbox46/ImageSharp.Sandbox46.csproj
index 7ff271964..3cbe2071d 100644
--- a/tests/ImageSharp.Sandbox46/ImageSharp.Sandbox46.csproj
+++ b/tests/ImageSharp.Sandbox46/ImageSharp.Sandbox46.csproj
@@ -21,6 +21,7 @@
     <PackageReference Include="BitMiracle.LibJpeg.NET" Version="1.4.280" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="Moq" Version="4.8.1" />
+    <PackageReference Include="System.Numerics.Vectors" Version="4.5.0-preview2-26406-04" />
     <!--<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />-->
     <!--<PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />-->
   </ItemGroup>