diff --git a/src/bunit/Diffing/BlazorDiffingHelpers.cs b/src/bunit/Diffing/BlazorDiffingHelpers.cs
index dab79c95e..605c59173 100644
--- a/src/bunit/Diffing/BlazorDiffingHelpers.cs
+++ b/src/bunit/Diffing/BlazorDiffingHelpers.cs
@@ -7,7 +7,7 @@ namespace Bunit.Diffing;
 /// <summary>
 /// Blazor Diffing Helpers.
 /// </summary>
-public static class BlazorDiffingHelpers
+internal static class BlazorDiffingHelpers
 {
 	/// <summary>
 	/// Represents a diffing filter that removes all special Blazor attributes added by the /<see cref="Htmlizer"/>.
diff --git a/src/bunit/Diffing/HtmlComparer.cs b/src/bunit/Diffing/HtmlComparer.cs
index 9fc2180bc..97bac7138 100644
--- a/src/bunit/Diffing/HtmlComparer.cs
+++ b/src/bunit/Diffing/HtmlComparer.cs
@@ -10,7 +10,7 @@ namespace Bunit.Diffing;
 /// <summary>
 /// Represents a test HTML comparer, that is configured to work with markup generated by the <see cref="BunitRenderer"/> and <see cref="Htmlizer"/> classes.
 /// </summary>
-public sealed class HtmlComparer
+internal sealed class HtmlComparer
 {
 	private readonly HtmlDiffer differenceEngine;
 
diff --git a/src/bunit/Extensions/BlazorExtensions.cs b/src/bunit/Extensions/BlazorExtensions.cs
index daba2f7cf..36b4a5618 100644
--- a/src/bunit/Extensions/BlazorExtensions.cs
+++ b/src/bunit/Extensions/BlazorExtensions.cs
@@ -3,7 +3,7 @@ namespace Bunit.Extensions;
 /// <summary>
 /// Extensions for Blazor types.
 /// </summary>
-public static class BlazorExtensions
+internal static class BlazorExtensions
 {
 	/// <summary>
 	/// Creates a <see cref="RenderFragment"/> that will render the <paramref name="markup"/>.
diff --git a/src/bunit/Extensions/BunitServiceProviderExtensions.cs b/src/bunit/Extensions/BunitServiceProviderExtensions.cs
index 4b89b03bb..f59dbbe82 100644
--- a/src/bunit/Extensions/BunitServiceProviderExtensions.cs
+++ b/src/bunit/Extensions/BunitServiceProviderExtensions.cs
@@ -12,7 +12,7 @@ namespace Bunit.Extensions;
 /// <summary>
 /// Helper methods for correctly registering test dependencies.
 /// </summary>
-public static class BunitServiceProviderExtensions
+internal static class BunitServiceProviderExtensions
 {
 	/// <summary>
 	/// Registers the default services required by the web <see cref="BunitContext"/>.
diff --git a/src/bunit/Rendering/BunitHtmlParser.cs b/src/bunit/Rendering/BunitHtmlParser.cs
index c2a41e18b..133e31edb 100644
--- a/src/bunit/Rendering/BunitHtmlParser.cs
+++ b/src/bunit/Rendering/BunitHtmlParser.cs
@@ -11,7 +11,7 @@ namespace Bunit.Rendering;
 /// A AngleSharp based HTML Parse that can parse markup strings
 /// into a <see cref="INodeList"/>.
 /// </summary>
-public sealed class BunitHtmlParser : IDisposable
+internal sealed class BunitHtmlParser : IDisposable
 {
 	private const string TbodySubElements = "TR";
 	private const string ColgroupSubElement = "COL";