diff --git a/Source/spamfilter/spamfilter.BL.Tests/spamfilter.BL.Tests.csproj b/Source/spamfilter/spamfilter.BL.Tests/spamfilter.BL.Tests.csproj
index ab041e3..445f971 100644
--- a/Source/spamfilter/spamfilter.BL.Tests/spamfilter.BL.Tests.csproj
+++ b/Source/spamfilter/spamfilter.BL.Tests/spamfilter.BL.Tests.csproj
@@ -10,7 +10,7 @@
 
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+      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
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       <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
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