diff --git a/LanguageTagsTests/LanguageTagsTests.csproj b/LanguageTagsTests/LanguageTagsTests.csproj
index 76139ca..974e8e9 100644
--- a/LanguageTagsTests/LanguageTagsTests.csproj
+++ b/LanguageTagsTests/LanguageTagsTests.csproj
@@ -10,7 +10,7 @@
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+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
     <PackageReference Include="xunit.analyzers" Version="1.27.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>