diff --git a/O21.CommandLine.Tests/O21.CommandLine.Tests.fsproj b/O21.CommandLine.Tests/O21.CommandLine.Tests.fsproj
index a54a7c1..6fc66aa 100644
--- a/O21.CommandLine.Tests/O21.CommandLine.Tests.fsproj
+++ b/O21.CommandLine.Tests/O21.CommandLine.Tests.fsproj
@@ -19,7 +19,7 @@ SPDX-License-Identifier: MIT
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+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1"/>
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         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2"/>
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diff --git a/O21.Tests/O21.Tests.fsproj b/O21.Tests/O21.Tests.fsproj
index 43c671a..72c6255 100644
--- a/O21.Tests/O21.Tests.fsproj
+++ b/O21.Tests/O21.Tests.fsproj
@@ -19,7 +19,7 @@ SPDX-License-Identifier: MIT
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     <ItemGroup>
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