diff --git a/dotnet/tests/IngestionSamples.Tests/IngestionSamples.Tests.csproj b/dotnet/tests/IngestionSamples.Tests/IngestionSamples.Tests.csproj
index 5063fb7..e1eb6c1 100644
--- a/dotnet/tests/IngestionSamples.Tests/IngestionSamples.Tests.csproj
+++ b/dotnet/tests/IngestionSamples.Tests/IngestionSamples.Tests.csproj
@@ -12,7 +12,7 @@
     <PackageReference Include="coverlet.collector" Version="6.0.4" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.0" />
     <!-- Explicit pins ensure compatibility runs validate the same two real Agent Framework dependencies used by
          the package graph rather than allowing transitive range selection to mask a mismatch. -->
     <PackageReference Include="Microsoft.Agents.AI.Abstractions" Version="$(AgentFrameworkVersion)" />
diff --git a/dotnet/tests/MongoDB.AgentFramework.Tests/MongoDB.AgentFramework.Tests.csproj b/dotnet/tests/MongoDB.AgentFramework.Tests/MongoDB.AgentFramework.Tests.csproj
index 93ddbc1..aa9b050 100644
--- a/dotnet/tests/MongoDB.AgentFramework.Tests/MongoDB.AgentFramework.Tests.csproj
+++ b/dotnet/tests/MongoDB.AgentFramework.Tests/MongoDB.AgentFramework.Tests.csproj
@@ -22,7 +22,7 @@
     <PackageReference Include="coverlet.collector" Version="6.0.4" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.0" />
     <!--
       Explicit, not just transitive through the ProjectReference below: building this test project directly
       from a clean restore (e.g. `dotnet test .\dotnet\MongoDB.AgentFramework.slnx` from the repo root) does not