diff --git a/README.md b/README.md
index 3d45218..65ed728 100644
--- a/README.md
+++ b/README.md
@@ -278,6 +278,7 @@ Issues / PRs welcome. Please keep additions dependency
 - Added liveness operators (`Heartbeat`, `DetectStale`, `BufferUntilInactive`).
 - Added resilience (`RetryWithBackoff`, expanded `OnErrorRetry` overloads).
 - Added flow control (`Conflate`, `ThrottleFirst`, `DebounceImmediate`).
+- Removed DisposeWith extension use System.Reactive.Disposables.Fluent from System.Reactive.
 
 ---
 Happy reactive coding!
diff --git a/src/ReactiveUI.Extensions.Tests/DisposableExtensionsTests.cs b/src/ReactiveUI.Extensions.Tests/DisposableExtensionsTests.cs
index 6b0bc2a..7ab185a 100644
--- a/src/ReactiveUI.Extensions.Tests/DisposableExtensionsTests.cs
+++ b/src/ReactiveUI.Extensions.Tests/DisposableExtensionsTests.cs
@@ -4,6 +4,7 @@
 
 using System;
 using System.Reactive.Disposables;
+using System.Reactive.Disposables.Fluent;
 using FluentAssertions;
 using Xunit;
 
diff --git a/src/ReactiveUI.Extensions/DisposableExtensions.cs b/src/ReactiveUI.Extensions/DisposableExtensions.cs
deleted file mode 100644
index 06c7811..0000000
--- a/src/ReactiveUI.Extensions/DisposableExtensions.cs
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright (c) 2019-2025 ReactiveUI Association Incorporated. All rights reserved.
-// ReactiveUI Association Incorporated licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for full license information.
-
-namespace ReactiveUI.Extensions;
-
-/// <summary>
-/// Extension methods associated with the IDisposable interface.
-/// </summary>
-public static class DisposableExtensions
-{
-    /// <summary>
-    /// Ensures the provided disposable is disposed with the specified <see cref="CompositeDisposable"/>.
-    /// </summary>
-    /// <typeparam name="T"> The type of the disposable. </typeparam>
-    /// <param name="item"> The disposable we are going to want to be disposed by the CompositeDisposable. </param>
-    /// <param name="compositeDisposable"> The <see cref="CompositeDisposable"/> to which <paramref name="item"/> will be added. </param>
-    /// <returns> The disposable.</returns>
-    public static T DisposeWith<T>(this T item, CompositeDisposable compositeDisposable)
-        where T : IDisposable
-    {
-#if NETSTANDARD
-        if (compositeDisposable is null)
-        {
-            throw new ArgumentNullException(nameof(compositeDisposable));
-        }
-#else
-        ArgumentNullException.ThrowIfNull(compositeDisposable);
-#endif
-
-        compositeDisposable.Add(item);
-        return item;
-    }
-}
diff --git a/src/directory.packages.props b/src/directory.packages.props
index e0a908c..aacbefa 100644
--- a/src/directory.packages.props
+++ b/src/directory.packages.props
@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageVersion Include="System.Reactive" Version="6.0.2" />
+    <PackageVersion Include="System.Reactive" Version="6.1.0" />
   </ItemGroup>
 
   <ItemGroup>