diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a1d1c9..f41eb95 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# [3.0.0-preview.14](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v3.0.0-preview.13...v3.0.0-preview.14) (2020-08-11)
+
+
+### Bug Fixes
+
+* read-only properties in the inspector ([f012b23](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/f012b238d97aad3fdc3107b1f9a197de869c43e6))
+
 # [3.0.0-preview.13](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v3.0.0-preview.12...v3.0.0-preview.13) (2020-08-11)
 
 
diff --git a/Scripts/Editor/UIParticleEditor.cs b/Scripts/Editor/UIParticleEditor.cs
index d659c4a..f343b3b 100644
--- a/Scripts/Editor/UIParticleEditor.cs
+++ b/Scripts/Editor/UIParticleEditor.cs
@@ -162,7 +162,10 @@ namespace Coffee.UIExtensions
         {
             serializedObject.Update();
 
+            EditorGUI.BeginDisabledGroup(true);
             EditorGUILayout.PropertyField(_spParticleSystem);
+            EditorGUI.EndDisabledGroup();
+
             EditorGUI.indentLevel++;
             var ps = _spParticleSystem.objectReferenceValue as ParticleSystem;
             if (ps)
@@ -170,12 +173,18 @@ namespace Coffee.UIExtensions
                 var pr = ps.GetComponent<ParticleSystemRenderer>();
                 var sp = new SerializedObject(pr).FindProperty("m_Materials");
 
-                EditorGUILayout.PropertyField(sp.GetArrayElementAtIndex(0), s_ContentParticleMaterial);
-                if (2 <= sp.arraySize)
+                EditorGUI.BeginChangeCheck();
                 {
-                    EditorGUILayout.PropertyField(sp.GetArrayElementAtIndex(1), s_ContentTrailMaterial);
+                    EditorGUILayout.PropertyField(sp.GetArrayElementAtIndex(0), s_ContentParticleMaterial);
+                    if (2 <= sp.arraySize)
+                    {
+                        EditorGUILayout.PropertyField(sp.GetArrayElementAtIndex(1), s_ContentTrailMaterial);
+                    }
+                }
+                if (EditorGUI.EndChangeCheck())
+                {
+                    sp.serializedObject.ApplyModifiedProperties();
                 }
-                sp.serializedObject.ApplyModifiedProperties();
 
                 if (!Application.isPlaying && pr.enabled)
                 {
@@ -282,4 +291,4 @@ namespace Coffee.UIExtensions
         }
     }
 }
-#endif // [ASMDEFEX] DO NOT REMOVE THIS LINE MANUALLY.
\ No newline at end of file
+#endif // [ASMDEFEX] DO NOT REMOVE THIS LINE MANUALLY.
diff --git a/package.json b/package.json
index 07e08fc..ffb8e86 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "com.coffee.ui-particle",
   "displayName": "UI Particle",
   "description": "This plugin provide a component to render particle effect for uGUI.\nThe particle rendering is maskable and sortable, without Camera, RenderTexture or Canvas.",
-  "version": "3.0.0-preview.13",
+  "version": "3.0.0-preview.14",
   "unity": "2018.2",
   "license": "MIT",
   "repository": {