diff --git a/Reactor.Benchmarks/AssetBundleBenchmarks.cs b/Reactor.Benchmarks/AssetBundleBenchmarks.cs
index e80e177..9e092c7 100644
--- a/Reactor.Benchmarks/AssetBundleBenchmarks.cs
+++ b/Reactor.Benchmarks/AssetBundleBenchmarks.cs
@@ -16,7 +16,7 @@ namespace Reactor.Benchmarks;
 [StopOnFirstError, Config(typeof(Config))]
 public class AssetBundleBenchmarks
 {
-    private class Config : ManualConfig
+    private sealed class Config : ManualConfig
     {
         public Config()
         {
diff --git a/Reactor/Networking/Patches/ReactorClientData.cs b/Reactor/Networking/Patches/ReactorClientData.cs
index 1fe5f38..981f71b 100644
--- a/Reactor/Networking/Patches/ReactorClientData.cs
+++ b/Reactor/Networking/Patches/ReactorClientData.cs
@@ -4,7 +4,7 @@ using InnerNet;
 
 namespace Reactor.Networking.Patches;
 
-internal class ReactorClientData
+internal sealed class ReactorClientData
 {
     public ClientData ClientData { get; }
 
diff --git a/Reactor/ReactorPlugin.cs b/Reactor/ReactorPlugin.cs
index 872c7d6..a69c3b9 100644
--- a/Reactor/ReactorPlugin.cs
+++ b/Reactor/ReactorPlugin.cs
@@ -93,7 +93,7 @@ public partial class ReactorPlugin : BasePlugin
     }
 
     [RegisterInIl2Cpp]
-    private class ReactorComponent : MonoBehaviour
+    private sealed class ReactorComponent : MonoBehaviour
     {
         [HideFromIl2Cpp]
         public ReactorPlugin? Plugin { get; internal set; }
diff --git a/Reactor/Utilities/Coroutines.cs b/Reactor/Utilities/Coroutines.cs
index d050a26..326a813 100644
--- a/Reactor/Utilities/Coroutines.cs
+++ b/Reactor/Utilities/Coroutines.cs
@@ -14,7 +14,7 @@ namespace Reactor.Utilities;
 public static class Coroutines
 {
     [RegisterInIl2Cpp]
-    internal class Component : MonoBehaviour
+    internal sealed class Component : MonoBehaviour
     {
         internal static Component? Instance { get; set; }
 
diff --git a/Reactor/Utilities/RegionInfoWatcher.cs b/Reactor/Utilities/RegionInfoWatcher.cs
index 461f1c7..1ecdbdb 100644
--- a/Reactor/Utilities/RegionInfoWatcher.cs
+++ b/Reactor/Utilities/RegionInfoWatcher.cs
@@ -7,7 +7,7 @@ using Object = UnityEngine.Object;
 
 namespace Reactor.Utilities;
 
-internal class RegionInfoWatcher : IDisposable
+internal sealed class RegionInfoWatcher : IDisposable
 {
     private FileSystemWatcher Watcher { get; }