diff --git a/vs4win/Chapter04/CalculatorLibUnitTests/CalculatorLibUnitTests.csproj b/vs4win/Chapter04/CalculatorLibUnitTests/CalculatorLibUnitTests.csproj
index 7f1fa4b..d0a4b91 100644
--- a/vs4win/Chapter04/CalculatorLibUnitTests/CalculatorLibUnitTests.csproj
+++ b/vs4win/Chapter04/CalculatorLibUnitTests/CalculatorLibUnitTests.csproj
@@ -8,13 +8,13 @@
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-    <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="xunit" Version="2.4.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
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-    <PackageReference Include="coverlet.collector" Version="3.1.0">
+    <PackageReference Include="coverlet.collector" Version="3.2.0">
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       <PrivateAssets>all</PrivateAssets>
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