diff --git a/ai-dev-net.tests.integration/ai-dev-net.tests.integration.csproj b/ai-dev-net.tests.integration/ai-dev-net.tests.integration.csproj
index 37166e1..630e68b 100644
--- a/ai-dev-net.tests.integration/ai-dev-net.tests.integration.csproj
+++ b/ai-dev-net.tests.integration/ai-dev-net.tests.integration.csproj
@@ -18,7 +18,7 @@
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     <PackageReference Include="xunit.v3" Version="3.2.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
-    <PackageReference Include="NSubstitute" Version="5.3.0" />
+    <PackageReference Include="NSubstitute" Version="6.0.0" />
     <PackageReference Include="Shouldly" Version="4.3.0" />
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diff --git a/ai-dev-net.tests.unit/ai-dev-net.tests.unit.csproj b/ai-dev-net.tests.unit/ai-dev-net.tests.unit.csproj
index e6f1674..d458a4f 100644
--- a/ai-dev-net.tests.unit/ai-dev-net.tests.unit.csproj
+++ b/ai-dev-net.tests.unit/ai-dev-net.tests.unit.csproj
@@ -1,40 +1,40 @@
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-  <PropertyGroup>
-    <TargetFramework>net10.0</TargetFramework>
-    <RootNamespace>AiDevNet.Tests.Unit</RootNamespace>
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-    <PackageReference Include="Shouldly" Version="4.3.0" />
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-  <ItemGroup>
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-    <ProjectReference Include="..\ai-dev.core.local\ai-dev.core.local.csproj" />
-    <ProjectReference Include="..\ai-dev.mcp\ai-dev.mcp.csproj" />
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-  <ItemGroup>
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-    <Using Include="AiDev.Features.Planning" />
-    <Using Include="AiDev.Features.Workspace" />
-    <Using Include="AiDev.Models.Types" />
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-</Project>
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
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+    <RootNamespace>AiDevNet.Tests.Unit</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
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+    <PackageReference Include="Shouldly" Version="4.3.0" />
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+    <ProjectReference Include="..\ai-dev.core.local\ai-dev.core.local.csproj" />
+    <ProjectReference Include="..\ai-dev.mcp\ai-dev.mcp.csproj" />
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+  <ItemGroup>
+    <Using Include="Xunit" />
+    <Using Include="Shouldly" />
+    <Using Include="NSubstitute" />
+    <Using Include="AiDev.Services" />
+    <Using Include="AiDev.Features.Agent" />
+    <Using Include="AiDev.Features.Board" />
+    <Using Include="AiDev.Features.Decision" />
+    <Using Include="AiDev.Features.Planning" />
+    <Using Include="AiDev.Features.Workspace" />
+    <Using Include="AiDev.Models.Types" />
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