diff --git a/Python/InedoExtension/InedoExtension.csproj b/Python/InedoExtension/InedoExtension.csproj
index 77eee8d..2f6e3a8 100644
--- a/Python/InedoExtension/InedoExtension.csproj
+++ b/Python/InedoExtension/InedoExtension.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net452;net5.0</TargetFrameworks>
+    <TargetFramework>net6.0</TargetFramework>
     <OutputType>Library</OutputType>
     <RootNamespace>Inedo.Extensions.Python</RootNamespace>
     <AssemblyName>Python</AssemblyName>
@@ -8,8 +8,8 @@
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Inedo.SDK" Version="1.11.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Inedo.SDK" Version="2.0.0-ci.18" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="BuildMasterTestRunner.py" />
diff --git a/Python/InedoExtension/Operations/CapturePackageInfoOperation.cs b/Python/InedoExtension/Operations/CapturePackageInfoOperation.cs
index 60ccaae..4adaae7 100644
--- a/Python/InedoExtension/Operations/CapturePackageInfoOperation.cs
+++ b/Python/InedoExtension/Operations/CapturePackageInfoOperation.cs
@@ -27,7 +27,8 @@ public override async Task ExecuteAsync(IOperationExecutionContext context)
                 WorkingDirectory = context.WorkingDirectory
             };
 
-            startInfo.Arguments += AH.ConcatNE(" ", this.AdditionalArguments);
+            if (!string.IsNullOrWhiteSpace(this.AdditionalArguments))
+                startInfo.Arguments += this.AdditionalArguments;
 
             await this.WrapInVirtualEnv(context, startInfo);
 
diff --git a/Python/InedoExtension/Operations/InstallPackagesOperation.cs b/Python/InedoExtension/Operations/InstallPackagesOperation.cs
index 358b197..e9eef36 100644
--- a/Python/InedoExtension/Operations/InstallPackagesOperation.cs
+++ b/Python/InedoExtension/Operations/InstallPackagesOperation.cs
@@ -35,7 +35,8 @@ public override async Task ExecuteAsync(IOperationExecutionContext context)
                 startInfo.Arguments += " -r requirements.txt";
             }
 
-            startInfo.Arguments += AH.ConcatNE(" ", this.AdditionalArguments);
+            if (!string.IsNullOrWhiteSpace(this.AdditionalArguments))
+                startInfo.Arguments += this.AdditionalArguments;
 
             await this.WrapInVirtualEnv(context, startInfo);
             await this.ExecuteCommandLineAsync(context, startInfo);
diff --git a/Python/InedoExtension/Operations/PyUnitOperation.cs b/Python/InedoExtension/Operations/PyUnitOperation.cs
index 5c3289c..f62fdb9 100644
--- a/Python/InedoExtension/Operations/PyUnitOperation.cs
+++ b/Python/InedoExtension/Operations/PyUnitOperation.cs
@@ -86,9 +86,9 @@ string getTestLog(IGrouping<TestCaseID, TestEvent> test)
                 var skipReason = test.FirstOrDefault(e => e.Type == EventType.Skip)?.Message;
                 var exceptions = test.Select(e => e.Err).Where(e => e != null).ToArray();
 
-                return "Test: " + test.Key.ID + AH.ConcatNE("\n", test.Key.Desc) +
-                    "\n\nResult: " + AH.CoalesceString(result, "Unknown") + AH.ConcatNE(" (", skipReason, ")") +
-                    AH.ConcatNE("\n\nOutput:\n", stdout) + AH.ConcatNE("\n\nError:\n", stderr) +
+                return "Test: " + test.Key.ID + ConcatNE("\n", test.Key.Desc) +
+                    "\n\nResult: " + AH.CoalesceString(result, "Unknown") + ConcatNE(" (", skipReason, ")") +
+                    ConcatNE("\n\nOutput:\n", stdout) + ConcatNE("\n\nError:\n", stderr) +
                     (exceptions.Any() ? "\n\nExceptions:\n\n" + string.Join("\n\n", exceptions) : string.Empty) +
                     "\n";
             }
@@ -104,6 +104,14 @@ TimeSpan getDuration(IGrouping<TestCaseID, TestEvent> test)
                 var end = (test.FirstOrDefault(e => e.Type == EventType.StopCase) ?? test.Last()).Time;
                 return TimeSpan.FromSeconds(end - start);
             }
+
+            static string ConcatNE(string a, string b, string c = "")
+            {
+                if (!string.IsNullOrEmpty(b))
+                    return a + b + c;
+                else
+                    return string.Empty;
+            }
         }
 
         private async Task RunTestsAsync(IOperationExecutionContext context)
@@ -150,7 +158,7 @@ protected override void LogProcessOutput(string text)
         {
             if (text.StartsWith("__BuildMasterPythonTestRunner__"))
             {
-                this.Events.Add(JsonConvert.DeserializeObject<TestEvent>(text.Substring("__BuildMasterPythonTestRunner__".Length)));
+                this.Events.Add(JsonConvert.DeserializeObject<TestEvent>(text["__BuildMasterPythonTestRunner__".Length..]));
                 return;
             }