diff --git a/.github/workflows/package.yaml b/.github/workflows/package.yaml
index 5284801..aa8ca4f 100644
--- a/.github/workflows/package.yaml
+++ b/.github/workflows/package.yaml
@@ -14,7 +14,7 @@ jobs:
     steps:
       # Checkout
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           lfs: true
 
@@ -39,7 +39,7 @@ jobs:
 
       # Upload
       - name: Upload .unitypackage
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: Unity Package
           path: Build
\ No newline at end of file
diff --git a/Assets/Example/Example.cs b/Assets/Example/Example.cs
index 08a4082..310514f 100644
--- a/Assets/Example/Example.cs
+++ b/Assets/Example/Example.cs
@@ -42,6 +42,17 @@ public class Grape : Food
 	}
 }
 
+[Serializable]
+[HideInTypeMenu]
+public class Banana : Food
+{
+	public Banana ()
+	{
+		name = "Banana";
+		kcal = 100f;
+	}
+}
+
 public class Example : MonoBehaviour
 {
 
diff --git a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
index e6a3f3e..6cdbecb 100644
--- a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
+++ b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
@@ -22,7 +22,7 @@ namespace MackySoft.SerializeReferenceExtensions.Editor
 		}
 
 		const int k_MaxTypePopupLineCount = 13;
-		static readonly Type k_UnityObjectType = typeof(UnityEngine.Object);
+		
 		static readonly GUIContent k_NullDisplayName = new GUIContent(TypeMenuUtility.k_NullDisplayName);
 		static readonly GUIContent k_IsNotManagedReferenceLabel = new GUIContent("The property type is not manage reference.");
 
@@ -129,13 +129,7 @@ namespace MackySoft.SerializeReferenceExtensions.Editor
 
 				Type baseType = ManagedReferenceUtility.GetType(managedReferenceFieldTypename);
 				var popup = new AdvancedTypePopup(
-					TypeCache.GetTypesDerivedFrom(baseType).Append(baseType).Where(p =>
-						(p.IsPublic || p.IsNestedPublic || p.IsNestedPrivate) &&
-						!p.IsAbstract &&
-						!p.IsGenericType &&
-						!k_UnityObjectType.IsAssignableFrom(p) &&
-						Attribute.IsDefined(p,typeof(SerializableAttribute))
-					),
+					TypeMenuUtility.GetTypes(baseType),
 					k_MaxTypePopupLineCount,
 					state
 				);
diff --git a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/TypeMenuUtility.cs b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/TypeMenuUtility.cs
index 4857c83..3465f19 100644
--- a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/TypeMenuUtility.cs
+++ b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/TypeMenuUtility.cs
@@ -2,11 +2,25 @@
 using System;
 using System.Linq;
 using System.Collections.Generic;
+using UnityEditor;
 
 namespace MackySoft.SerializeReferenceExtensions.Editor {
 	public static class TypeMenuUtility {
 
 		public const string k_NullDisplayName = "<null>";
+		static readonly Type k_UnityObjectType = typeof(UnityEngine.Object);
+
+		public static IEnumerable<Type> GetTypes (Type baseType)
+		{
+			return TypeCache.GetTypesDerivedFrom(baseType).Append(baseType).Where(p =>
+				(p.IsPublic || p.IsNestedPublic || p.IsNestedPrivate) &&
+				!p.IsAbstract &&
+				!p.IsGenericType &&
+				!k_UnityObjectType.IsAssignableFrom(p) &&
+				Attribute.IsDefined(p, typeof(SerializableAttribute)) &&
+				!Attribute.IsDefined(p, typeof(HideInTypeMenuAttribute))
+			);
+		}
 
 		public static AddTypeMenuAttribute GetAttribute (Type type) {
 			return Attribute.GetCustomAttribute(type,typeof(AddTypeMenuAttribute)) as AddTypeMenuAttribute;
diff --git a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Runtime/HideInTypeMenuAttribute.cs b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Runtime/HideInTypeMenuAttribute.cs
new file mode 100644
index 0000000..716aaac
--- /dev/null
+++ b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Runtime/HideInTypeMenuAttribute.cs
@@ -0,0 +1,11 @@
+#if UNITY_2019_3_OR_NEWER
+using System;
+
+/// <summary>
+/// An attribute that hides the type in the SubclassSelector.
+/// </summary>
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Interface, AllowMultiple = false, Inherited = false)]
+public sealed class HideInTypeMenuAttribute : Attribute {
+
+}
+#endif
\ No newline at end of file
diff --git a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Runtime/HideInTypeMenuAttribute.cs.meta b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Runtime/HideInTypeMenuAttribute.cs.meta
new file mode 100644
index 0000000..dd44d0d
--- /dev/null
+++ b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Runtime/HideInTypeMenuAttribute.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 9f48f5d86a108b94a9c26381f5ce678c
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: