diff --git a/src/Stravaig.FamilyTree.Standardiser.UnitTests/Stravaig.FamilyTree.Standardiser.UnitTests.csproj b/src/Stravaig.FamilyTree.Standardiser.UnitTests/Stravaig.FamilyTree.Standardiser.UnitTests.csproj
index 4a4c9c1..54626d3 100644
--- a/src/Stravaig.FamilyTree.Standardiser.UnitTests/Stravaig.FamilyTree.Standardiser.UnitTests.csproj
+++ b/src/Stravaig.FamilyTree.Standardiser.UnitTests/Stravaig.FamilyTree.Standardiser.UnitTests.csproj
@@ -9,7 +9,7 @@
     <ItemGroup>
         <PackageReference Include="nunit" Version="3.13.1" />
         <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
         <PackageReference Include="Shouldly" Version="4.0.3" />
     </ItemGroup>
 
diff --git a/src/Stravaig.FamilyTreeGenerator.Tests/Stravaig.FamilyTreeGenerator.Tests.csproj b/src/Stravaig.FamilyTreeGenerator.Tests/Stravaig.FamilyTreeGenerator.Tests.csproj
index 9492b01..dcab449 100644
--- a/src/Stravaig.FamilyTreeGenerator.Tests/Stravaig.FamilyTreeGenerator.Tests.csproj
+++ b/src/Stravaig.FamilyTreeGenerator.Tests/Stravaig.FamilyTreeGenerator.Tests.csproj
@@ -9,7 +9,7 @@
     <ItemGroup>
         <PackageReference Include="nunit" Version="3.13.1" />
         <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/Stravaig.Gedcom.UnitTests/Stravaig.Gedcom.UnitTests.csproj b/src/Stravaig.Gedcom.UnitTests/Stravaig.Gedcom.UnitTests.csproj
index 692a049..534f00c 100644
--- a/src/Stravaig.Gedcom.UnitTests/Stravaig.Gedcom.UnitTests.csproj
+++ b/src/Stravaig.Gedcom.UnitTests/Stravaig.Gedcom.UnitTests.csproj
@@ -10,7 +10,7 @@
     <ItemGroup>
         <PackageReference Include="nunit" Version="3.13.1" />
         <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
         <PackageReference Include="Shouldly" Version="4.0.3" />
     </ItemGroup>