diff --git a/bin/rate_update.py b/bin/rate_update.py
index f4a68c6..cf1d508 100755
--- a/bin/rate_update.py
+++ b/bin/rate_update.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
 """
 Rate Update Script
 
@@ -85,7 +86,7 @@ MODEL_CONFIG_FILE = CONFIG_DIR / 'rate_model.ai'
 def get_ai_model():
     """Obtener el modelo de IA configurado."""
     try:
-        with open(MODEL_CONFIG_FILE, 'r') as f:
+        with open(MODEL_CONFIG_FILE, 'r', encoding='utf-8') as f:
             model = f.read().strip()
             # Si hay un valor específico configurado, usarlo
             if model and model.strip():
@@ -114,7 +115,7 @@ def get_perplexity_api_key():
             try:
                 if os.path.exists(path):
                     logger.info(f"Intentando cargar API key desde: {path}")
-                    with open(path, 'r') as f:
+                    with open(path, 'r', encoding='utf-8') as f:
                         api_key = f.read().strip()
                         if api_key:
                             logger.info("API key de Perplexity cargada desde archivo.")
@@ -534,7 +535,7 @@ def update_rate_files():
             logger.info(f"Valor de respaldo generado: {rate:.2f}")
         
         # Guardar el resultado en el archivo - solo el valor numérico con dos decimales, sin salto de línea
-        with open(rate_file, 'w') as f:
+        with open(rate_file, 'w', encoding='utf-8') as f:
             f.write(f"{rate:.2f}")
         logger.info(f"Actualizado {os.path.basename(rate_file)} con valor: {rate:.2f}")