diff --git a/src/Schematron.Tests/Schematron.Tests.csproj b/src/Schematron.Tests/Schematron.Tests.csproj
index 8ab7382..a4aa083 100644
--- a/src/Schematron.Tests/Schematron.Tests.csproj
+++ b/src/Schematron.Tests/Schematron.Tests.csproj
@@ -11,7 +11,7 @@
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+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
     <PackageReference Include="xunit" Version="2.*" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
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