Update app.py

app.py

@@ -11,7 +11,7 @@ app = Flask(__name__)
 line_bot_api = LineBotApi(os.environ.get('LINE_CHANNEL_ACCESS_TOKEN'))
 handler = WebhookHandler(os.environ.get('LINE_CHANNEL_SECRET'))
 genai.configure(api_key=os.environ.get('GEMINI_API_KEY'))
-model = genai.GenerativeModel('gemini-1.5-flash-latest')
+model = genai.GenerativeModel('gemini-2.5-flash')
 
 # ================= 2. 建立狀態儲存區（暫存每個用戶的進度） =================
 user_states = {}