diff --git a/README.md b/README.md
index 3ecd22f2..db156c0d 100644
--- a/README.md
+++ b/README.md
@@ -164,8 +164,6 @@ docker push yym68686/chatgpt:1.0
 
 ## Reference
 
-Reference Projects:
-
 https://core.telegram.org/bots/api
 
 https://github.com/acheong08/ChatGPT
diff --git a/config.py b/config.py
index 367e77be..a42d6e0c 100644
--- a/config.py
+++ b/config.py
@@ -9,8 +9,8 @@
 if os.environ.get('GOOGLE_API_KEY', None) == None and os.environ.get('GOOGLE_CSE_ID', None) == None:
     USE_GOOGLE = False
 temperature = float(os.environ.get('temperature', '0.5'))
-GPT_ENGINE = os.environ.get('GPT_ENGINE', 'gpt-3.5-turbo-1106')
-# DEFAULT_SEARCH_MODEL = os.environ.get('DEFAULT_SEARCH_MODEL', 'gpt-3.5-turbo-16k')
+GPT_ENGINE = os.environ.get('GPT_ENGINE', 'gpt-3.5-turbo-16k')
+# DEFAULT_SEARCH_MODEL = os.environ.get('DEFAULT_SEARCH_MODEL', 'gpt-3.5-turbo-1106')
 SEARCH_USE_GPT = (os.environ.get('SEARCH_USE_GPT', "True") == "False") == False
 API_URL = os.environ.get('API_URL', 'https://api.openai.com/v1/chat/completions')
 PDF_EMBEDDING = (os.environ.get('PDF_EMBEDDING', "True") == "False") == False
diff --git a/requirements.txt b/requirements.txt
index 85d748da..f927e737 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,10 +6,10 @@ flask[async]
 python-telegram-bot==20.4
 
 # langchain
-openai==0.28.1
 chromadb
 wikipedia
 fake_useragent
+openai==0.28.1
 google-api-python-client
 unstructured[md]
 unstructured[pdf]