diff --git a/text2text/pytorch_pretrained_bert/modeling.py b/text2text/pytorch_pretrained_bert/modeling.py
index b57d6b2..1e3f218 100755
--- a/text2text/pytorch_pretrained_bert/modeling.py
+++ b/text2text/pytorch_pretrained_bert/modeling.py
@@ -105,8 +105,7 @@ def __init__(self,
         if isinstance(vocab_size_or_config_json_file, str):
             with open(vocab_size_or_config_json_file, "r", encoding='utf-8') as reader:
                 json_config = json.loads(reader.read())
-            for key, value in json_config.items():
-                self.__dict__[key] = value
+            self.__dict__.update(json_config)
         elif isinstance(vocab_size_or_config_json_file, int):
             self.vocab_size = vocab_size_or_config_json_file
             self.hidden_size = hidden_size
@@ -135,8 +134,7 @@ def __init__(self,
     def from_dict(cls, json_object):
         """Constructs a `BertConfig` from a Python dictionary of parameters."""
         config = BertConfig(vocab_size_or_config_json_file=-1)
-        for key, value in json_object.items():
-            config.__dict__[key] = value
+        config.__dict__.update(json_object)
         return config
 
     @classmethod