diff --git a/Directory.Build.props b/Directory.Build.props
index 3f87bff..0a0e05e 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -16,7 +16,7 @@
     <AnalysisMode>Recommended</AnalysisMode>
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <WarningsAsErrors>nullable</WarningsAsErrors>
-    <WarningsAsErrors Condition="'$(ContinuousIntegrationBuild)' == 'true'">true</WarningsAsErrors>
+    <TreatWarningsAsErrors Condition="'$(ContinuousIntegrationBuild)' == 'true'">true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <PropertyGroup Label="NuGet Package Info">
diff --git a/src/process/CommandTask.cs b/src/process/CommandTask.cs
index 4e1887f..a6c3f5c 100644
--- a/src/process/CommandTask.cs
+++ b/src/process/CommandTask.cs
@@ -8,7 +8,7 @@ namespace Geekeey.Process;
 /// <summary>
 /// Represents an asynchronous execution of a command.
 /// </summary>
-public partial class CommandTask<TResult> : IDisposable
+public sealed partial class CommandTask<TResult> : IDisposable
 {
 	private readonly Process _process;
 
@@ -82,7 +82,7 @@ public partial class CommandTask<TResult> : IDisposable
 	}
 }
 
-public partial class CommandTask<TResult>
+public sealed partial class CommandTask<TResult>
 {
 	/// <summary>
 	/// Converts the command task into a regular task.
@@ -91,4 +91,4 @@ public partial class CommandTask<TResult>
 	{
 		return commandTask.Task;
 	}
-}
\ No newline at end of file
+}