diff --git a/app.py b/app.py
index 9410dfd..7f088de 100644
--- a/app.py
+++ b/app.py
@@ -10,10 +10,12 @@
 from typing import Optional, Union
 
 # Tkinter import for folder/file dialog (Windows native dialog)
+import platform
 try:
     import tkinter as tk
     from tkinter import filedialog
-    TKINTER_AVAILABLE = True
+    # macOSではTkinterダイアログを無効化（システム互換性の問題のため）
+    TKINTER_AVAILABLE = platform.system() == "Windows"
 except ImportError:
     TKINTER_AVAILABLE = False