diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb88270..77c9538 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,11 +29,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- X10D: `DateTime.Age(DateTime)` and `DateTimeOffset.Age(DateTimeOffset)` parameter renamed from `asOf` to `referenceDate`.
+- X10D: DateTime.Age(DateTime) and DateTimeOffset.Age(DateTimeOffset) parameter renamed from asOf to referenceDate.
 
 ### Removed
 
-- X10D: Removed `IEnumerable<T>.ConcatOne` - this functionality already exists with `Append`. 
+- X10D: Removed `IEnumerable<T>.ConcatOne` - this functionality already exists with `Append`.
+
+## [3.2.2] - 2023-06-05
+
+### Added
+
+- X10D.DSharpPlus: Added support for new usernames. See https://discord.com/blog/usernames
+
+## 3.2.1 - 2023-06-05
+
+ERRONEOUS RELEASE.
 
 ## [3.2.0] - 2023-04-03
 
@@ -597,7 +607,8 @@ please [open an issue](https://github.com/oliverbooth/X10D/issues)!
 
 Earlier versions of this package are undocumented and unlisted from package results.
 
-[unreleased]: https://github.com/oliverbooth/X10D/compare/v3.2.0...main
+[unreleased]: https://github.com/oliverbooth/X10D/compare/v3.2.2...main
+[3.2.2]: https://github.com/oliverbooth/X10D/releases/tag/v3.2.2
 [3.2.0]: https://github.com/oliverbooth/X10D/releases/tag/v3.2.0
 [3.1.0]: https://github.com/oliverbooth/X10D/releases/tag/v3.1.0
 [3.0.0]: https://github.com/oliverbooth/X10D/releases/tag/v3.0.0
diff --git a/X10D.DSharpPlus/src/DiscordUserExtensions.cs b/X10D.DSharpPlus/src/DiscordUserExtensions.cs
index adfd477..33eaa6e 100644
--- a/X10D.DSharpPlus/src/DiscordUserExtensions.cs
+++ b/X10D.DSharpPlus/src/DiscordUserExtensions.cs
@@ -68,6 +68,12 @@ public static class DiscordUserExtensions
             throw new ArgumentNullException(nameof(user));
         }
 
+        if (user.Discriminator == "0")
+        {
+            // user has a new username. see: https://discord.com/blog/usernames
+            return user.Username;
+        }
+
         return $"{user.Username}#{user.Discriminator}";
     }
 
diff --git a/X10D.Tests/X10D.Tests.csproj b/X10D.Tests/X10D.Tests.csproj
index 00ea605..aa5bbd2 100644
--- a/X10D.Tests/X10D.Tests.csproj
+++ b/X10D.Tests/X10D.Tests.csproj
@@ -17,7 +17,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0"/>
-        <PackageReference Include="Moq" Version="4.18.4"/>
+        <PackageReference Include="NSubstitute" Version="5.0.0"/>
         <PackageReference Include="NUnit" Version="3.13.3"/>
         <PackageReference Include="NUnit3TestAdapter" Version="4.4.2"/>
         <PackageReference Include="NUnit.Analyzers" Version="3.6.1"/>
diff --git a/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAll.cs b/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAll.cs
index ebce1e4..3330de8 100644
--- a/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAll.cs
+++ b/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAll.cs
@@ -1,5 +1,5 @@
 using System.Collections.ObjectModel;
-using Moq;
+using NSubstitute;
 using NUnit.Framework;
 using X10D.Collections;
 
@@ -13,16 +13,17 @@ public partial class CollectionTests
         [Test]
         public void ClearAndDisposeAll_ShouldClearAndDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IDisposable>();
-            var mock2 = new Mock<IDisposable>();
-            var mock3 = new Mock<IDisposable>();
-            var list = new List<IDisposable> {mock1.Object, mock2.Object, mock3.Object};
+            var substitute1 = Substitute.For<IDisposable>();
+            var substitute2 = Substitute.For<IDisposable>();
+            var substitute3 = Substitute.For<IDisposable>();
+            var list = new List<IDisposable> {substitute1, substitute2, substitute3};
 
             list.ClearAndDisposeAll();
 
-            mock1.Verify(i => i.Dispose(), Times.Once);
-            mock2.Verify(i => i.Dispose(), Times.Once);
-            mock3.Verify(i => i.Dispose(), Times.Once);
+            substitute1.Received(1).Dispose();
+            substitute2.Received(1).Dispose();
+            substitute3.Received(1).Dispose();
+
             Assert.That(list, Is.Empty);
         }
 
@@ -36,8 +37,8 @@ public partial class CollectionTests
         [Test]
         public void ClearAndDisposeAll_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
         {
-            var mock = new Mock<IDisposable>();
-            var list = new ReadOnlyCollection<IDisposable>(new List<IDisposable> {mock.Object});
+            var substitute = Substitute.For<IDisposable>();
+            var list = new ReadOnlyCollection<IDisposable>(new List<IDisposable> {substitute});
 
             Assert.Throws<InvalidOperationException>(() => list.ClearAndDisposeAll());
         }
diff --git a/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAllAsync.cs b/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAllAsync.cs
index 560eac7..c8b3c6a 100644
--- a/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAllAsync.cs
+++ b/X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAllAsync.cs
@@ -1,5 +1,5 @@
 using System.Collections.ObjectModel;
-using Moq;
+using NSubstitute;
 using NUnit.Framework;
 using X10D.Collections;
 
@@ -13,16 +13,17 @@ public partial class CollectionTests
         [Test]
         public async Task ClearAndDisposeAllAsync_ShouldClearAndDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IAsyncDisposable>();
-            var mock2 = new Mock<IAsyncDisposable>();
-            var mock3 = new Mock<IAsyncDisposable>();
-            var list = new List<IAsyncDisposable> {mock1.Object, mock2.Object, mock3.Object};
+            var substitute1 = Substitute.For<IAsyncDisposable>();
+            var substitute2 = Substitute.For<IAsyncDisposable>();
+            var substitute3 = Substitute.For<IAsyncDisposable>();
+            var list = new List<IAsyncDisposable> {substitute1, substitute2, substitute3};
 
             await list.ClearAndDisposeAllAsync().ConfigureAwait(false);
 
-            mock1.Verify(i => i.DisposeAsync(), Times.Once);
-            mock2.Verify(i => i.DisposeAsync(), Times.Once);
-            mock3.Verify(i => i.DisposeAsync(), Times.Once);
+            await substitute1.Received(1).DisposeAsync();
+            await substitute2.Received(1).DisposeAsync();
+            await substitute3.Received(1).DisposeAsync();
+
             Assert.That(list, Is.Empty);
         }
 
@@ -36,8 +37,8 @@ public partial class CollectionTests
         [Test]
         public void ClearAndDisposeAllAsync_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
         {
-            var mock = new Mock<IAsyncDisposable>();
-            var list = new ReadOnlyCollection<IAsyncDisposable>(new List<IAsyncDisposable> {mock.Object});
+            var substitute = Substitute.For<IAsyncDisposable>();
+            var list = new ReadOnlyCollection<IAsyncDisposable>(new List<IAsyncDisposable> {substitute});
 
             Assert.ThrowsAsync<InvalidOperationException>(list.ClearAndDisposeAllAsync);
         }
diff --git a/X10D.Tests/src/Collections/EnumerableTests.DisposeAll.cs b/X10D.Tests/src/Collections/EnumerableTests.DisposeAll.cs
index d5a4b8e..a402ceb 100644
--- a/X10D.Tests/src/Collections/EnumerableTests.DisposeAll.cs
+++ b/X10D.Tests/src/Collections/EnumerableTests.DisposeAll.cs
@@ -1,4 +1,4 @@
-using Moq;
+using NSubstitute;
 using NUnit.Framework;
 using X10D.Collections;
 
@@ -12,16 +12,16 @@ public partial class EnumerableTests
         [Test]
         public void DisposeAll_ShouldDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IDisposable>();
-            var mock2 = new Mock<IDisposable>();
-            var mock3 = new Mock<IDisposable>();
-            var list = new List<IDisposable> {mock1.Object, mock2.Object, null!, mock3.Object};
+            var substitute1 = Substitute.For<IDisposable>();
+            var substitute2 = Substitute.For<IDisposable>();
+            var substitute3 = Substitute.For<IDisposable>();
+            var list = new List<IDisposable> { substitute1, substitute2, null!, substitute3 };
 
             list.DisposeAll();
 
-            mock1.Verify(i => i.Dispose(), Times.Once);
-            mock2.Verify(i => i.Dispose(), Times.Once);
-            mock3.Verify(i => i.Dispose(), Times.Once);
+            substitute1.Received(1).Dispose();
+            substitute2.Received(1).Dispose();
+            substitute3.Received(1).Dispose();
         }
 
         [Test]
diff --git a/X10D.Tests/src/Collections/EnumerableTests.DisposeAllAsync.cs b/X10D.Tests/src/Collections/EnumerableTests.DisposeAllAsync.cs
index 867006e..1510338 100644
--- a/X10D.Tests/src/Collections/EnumerableTests.DisposeAllAsync.cs
+++ b/X10D.Tests/src/Collections/EnumerableTests.DisposeAllAsync.cs
@@ -1,4 +1,4 @@
-using Moq;
+using NSubstitute;
 using NUnit.Framework;
 using X10D.Collections;
 
@@ -12,16 +12,16 @@ public partial class EnumerableTests
         [Test]
         public async Task DisposeAllAsync_ShouldDisposeAllItems_WhenCalledWithValidList()
         {
-            var mock1 = new Mock<IAsyncDisposable>();
-            var mock2 = new Mock<IAsyncDisposable>();
-            var mock3 = new Mock<IAsyncDisposable>();
-            var list = new List<IAsyncDisposable> {mock1.Object, mock2.Object, null!, mock3.Object};
+            var substitute1 = Substitute.For<IAsyncDisposable>();
+            var substitute2 = Substitute.For<IAsyncDisposable>();
+            var substitute3 = Substitute.For<IAsyncDisposable>();
+            var list = new List<IAsyncDisposable> { substitute1, substitute2, null!, substitute3 };
 
             await list.DisposeAllAsync().ConfigureAwait(false);
 
-            mock1.Verify(i => i.DisposeAsync(), Times.Once);
-            mock2.Verify(i => i.DisposeAsync(), Times.Once);
-            mock3.Verify(i => i.DisposeAsync(), Times.Once);
+            await substitute1.Received(1).DisposeAsync();
+            await substitute2.Received(1).DisposeAsync();
+            await substitute3.Received(1).DisposeAsync();
         }
 
         [Test]