diff --git a/tests/Xunit.DataAttributes.Tests/Xunit.DataAttributes.Tests.csproj b/tests/Xunit.DataAttributes.Tests/Xunit.DataAttributes.Tests.csproj
index 7a850f9..5801ab3 100644
--- a/tests/Xunit.DataAttributes.Tests/Xunit.DataAttributes.Tests.csproj
+++ b/tests/Xunit.DataAttributes.Tests/Xunit.DataAttributes.Tests.csproj
@@ -28,7 +28,7 @@
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+    <PackageReference Include="Shouldly" Version="4.0.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
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