diff --git a/src/ModularPipelines.Build/Modules/RunUnitTestsModule.cs b/src/ModularPipelines.Build/Modules/RunUnitTestsModule.cs
index 086e6150f..2ec8069d1 100644
--- a/src/ModularPipelines.Build/Modules/RunUnitTestsModule.cs
+++ b/src/ModularPipelines.Build/Modules/RunUnitTestsModule.cs
@@ -27,7 +27,7 @@ public class RunUnitTestsModule : Module<CommandResult[]>
                 Project = unitTestProjectFile.Path,
                 NoBuild = true,
                 Framework = "net8.0",
-                Arguments = ["--coverage", "--coverage-output-format", "cobertura"],
+                Arguments = ["--coverage", "--coverage-output-format", "cobertura", "--fail-fast"],
                 Configuration = Configuration.Release,
                 EnvironmentVariables = new Dictionary<string, string?>
                 {
diff --git a/test/ModularPipelines.UnitTests/ParallelLimiterTests.cs b/test/ModularPipelines.UnitTests/ParallelLimiterTests.cs
index daaa10fdd..3342f282a 100644
--- a/test/ModularPipelines.UnitTests/ParallelLimiterTests.cs
+++ b/test/ModularPipelines.UnitTests/ParallelLimiterTests.cs
@@ -1,4 +1,3 @@
-using System.Collections.Concurrent;
 using ModularPipelines.Context;
 using ModularPipelines.Interfaces;
 using ModularPipelines.Modules;