diff --git a/requirements.txt b/requirements.txt
index f5e9b15c1..da8aa26b2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -69,5 +69,4 @@ imap_tools==1.5.0  # Used by metagpt/tools/libs/email_login.py
 qianfan==0.3.2
 dashscope==1.14.1
 rank-bm25==0.2.2  # for tool recommendation
-jieba==0.42.1  # for tool recommendation
-flask   # for web api
\ No newline at end of file
+jieba==0.42.1  # for tool recommendation
\ No newline at end of file
diff --git a/setup.py b/setup.py
index f834b4c44..257263bba 100644
--- a/setup.py
+++ b/setup.py
@@ -38,6 +38,7 @@ extras_require = {
         "llama-index-vector-stores-faiss==0.1.1",
         "chromadb==0.4.23",
     ],
+    "web-api": ["flask==3.0.2"],
 }
 
 extras_require["test"] = [