diff --git a/metagpt/configs/search_config.py b/metagpt/configs/search_config.py
index 5f7f2d9a3..7b50fb6d3 100644
--- a/metagpt/configs/search_config.py
+++ b/metagpt/configs/search_config.py
@@ -7,7 +7,7 @@
 """
 from typing import Callable, Optional
 
-from pydantic import Field
+from pydantic import ConfigDict, Field
 
 from metagpt.tools import SearchEngineType
 from metagpt.utils.yaml_model import YamlModel
@@ -16,10 +16,11 @@ from metagpt.utils.yaml_model import YamlModel
 class SearchConfig(YamlModel):
     """Config for Search"""
 
+    model_config = ConfigDict(extra="allow")
+
     api_type: SearchEngineType = SearchEngineType.DUCK_DUCK_GO
     api_key: str = ""
     cse_id: str = ""  # for google
-    discovery_service_url: str = ""  # for google
     search_func: Optional[Callable] = None
     params: dict = Field(
         default_factory=lambda: {
diff --git a/metagpt/tools/search_engine_serper.py b/metagpt/tools/search_engine_serper.py
index bcb959ed3..932f2eb44 100644
--- a/metagpt/tools/search_engine_serper.py
+++ b/metagpt/tools/search_engine_serper.py
@@ -34,6 +34,7 @@ class SerperWrapper(BaseModel):
                 "To use serper search engine, make sure you provide the `api_key` when constructing an object. You can obtain "
                 "an API key from https://serper.dev/."
             )
+
         return values
 
     async def run(self, query: str, max_results: int = 8, as_string: bool = True, **kwargs: Any) -> str:
@@ -56,7 +57,7 @@ class SerperWrapper(BaseModel):
                     response.raise_for_status()
                     res = await response.json()
         else:
-            async with self.aiosession.get.post(self.url, data=payloads, headers=headers, proxy=self.proxy) as response:
+            async with self.aiosession.post(self.url, data=payloads, headers=headers, proxy=self.proxy) as response:
                 response.raise_for_status()
                 res = await response.json()