diff --git a/config.py b/config.py
index 42c1c404..dd16d9c4 100644
--- a/config.py
+++ b/config.py
@@ -399,15 +399,6 @@ class Config:
             self._STARTUP_OSC_ENABLED_CHECK = value
             saveJson(self.PATH_CONFIG, inspect.currentframe().f_code.co_name, value)
 
-    @property
-    def UPDATE_FLAG(self):
-        return self._UPDATE_FLAG
-
-    @UPDATE_FLAG.setter
-    def UPDATE_FLAG(self, value):
-        if type(value) is bool:
-            self._UPDATE_FLAG = value
-
     @property
     def GITHUB_URL(self):
         return self._GITHUB_URL
@@ -519,7 +510,6 @@ class Config:
         self._ENABLE_NOTICE_XSOVERLAY = False
         self._ENABLE_SEND_MESSAGE_TO_VRC = True
         self._STARTUP_OSC_ENABLED_CHECK = True
-        self._UPDATE_FLAG = False
         self._GITHUB_URL = "https://api.github.com/repos/misyaguziya/VRCT/releases/latest"
         # self._BREAK_KEYSYM_LIST = [
         #     "Delete", "Select", "Up", "Down", "Next", "End", "Print",
diff --git a/main.py b/main.py
index 303a7671..73c62eb7 100644
--- a/main.py
+++ b/main.py
@@ -223,9 +223,6 @@ def callbackSelectedLanguagePresetTab(selected_tab_no):
 def callbackSetAuthKeys(keys):
     config.AUTH_KEYS = keys
 
-def callbackChangeStatusSoftwareUpdated(value):
-    config.UPDATE_FLAG = value
-
 # command func
 def callbackToggleTranslation(is_turned_on):
     config.ENABLE_TRANSLATION = is_turned_on
@@ -583,7 +580,8 @@ if config.STARTUP_OSC_ENABLED_CHECK is True and config.ENABLE_SEND_MESSAGE_TO_VR
     model.checkOSCStarted(view.printToTextbox_OSCError)
 
 # check Software Updated
-model.checkSoftwareUpdated(callbackChangeStatusSoftwareUpdated)
+if model.checkSoftwareUpdated() is True:
+    view.showUpdateAvailableButton()
 
 # init logger
 if config.ENABLE_LOGGER is True:
@@ -668,8 +666,5 @@ view.register(
     },
 )
 
-if config.UPDATE_FLAG is True:
-    view.showUpdateAvailableButton()
-
 if __name__ == "__main__":
     view.startMainLoop()
\ No newline at end of file
diff --git a/model.py b/model.py
index 26a01bef..1bb20dbd 100644
--- a/model.py
+++ b/model.py
@@ -219,15 +219,15 @@ class Model:
             fnc()
 
     @staticmethod
-    def checkSoftwareUpdated(fnc):
+    def checkSoftwareUpdated():
         # check update
+        update_flag = False
         response = requests_get(config.GITHUB_URL)
-        tag_name = response.json()["tag_name"]
-        if tag_name != config.VERSION:
-            try:
-                fnc(True)
-            except:
-                pass
+        new_version = response.json()["name"]
+        if new_version != config.VERSION:
+            update_flag = True
+        print("software version", "now:", config.VERSION, "new:", new_version)
+        return update_flag
 
     @staticmethod
     def getListInputHost():