diff --git a/config.py b/config.py
index 8b2d3290..cf5075b2 100644
--- a/config.py
+++ b/config.py
@@ -316,7 +316,7 @@ class Config:
         if type(value) is dict and set(value.keys()) == set(self.AUTH_KEYS.keys()):
             for key, value in value.items():
                 if type(value) is str:
-                    self._AUTH_KEYS[key] = value[key]
+                    self._AUTH_KEYS[key] = value
             save_json(self.PATH_CONFIG, inspect.currentframe().f_code.co_name, self.AUTH_KEYS)
 
     @property
diff --git a/window_config.py b/window_config.py
index ef18acf2..8b28937e 100644
--- a/window_config.py
+++ b/window_config.py
@@ -437,7 +437,9 @@ class ToplevelWindowConfig(CTkToplevel):
         value = self.entry_authkey.get()
         if len(value) > 0:
             if self.parent.translator.authentication("DeepL(auth)", value) is True:
-                config.AUTH_KEYS["DeepL(auth)"] = value
+                auth_keys = config.AUTH_KEYS
+                auth_keys["DeepL(auth)"] = value
+                config.AUTH_KEYS = auth_keys
                 print_textbox(self.parent.textbox_message_log, "Auth key update completed", "INFO")
                 print_textbox(self.parent.textbox_message_system_log, "Auth key update completed", "INFO")
             else: