diff --git a/pr_agent/algo/ai_handlers/langchain_ai_handler.py b/pr_agent/algo/ai_handlers/langchain_ai_handler.py
index 5a9dbc3bc..2f3b88c13 100644
--- a/pr_agent/algo/ai_handlers/langchain_ai_handler.py
+++ b/pr_agent/algo/ai_handlers/langchain_ai_handler.py
@@ -20,35 +20,13 @@ def __init__(self):
         # Initialize OpenAIHandler specific attributes here
         super().__init__()
         self.azure = get_settings().get("OPENAI.API_TYPE", "").lower() == "azure"
-        try:
-            if self.azure:
-                # using a partial function so we can set the deployment_id later to support fallback_deployments
-                # but still need to access the other settings now so we can raise a proper exception if they're missing
-                self._chat = functools.partial(
-                    lambda **kwargs: AzureChatOpenAI(**kwargs),
-                    openai_api_key=get_settings().openai.key,
-                    openai_api_base=get_settings().openai.api_base,
-                    openai_api_version=get_settings().openai.api_version,
-                )
-            else:
-                # for llms that compatible with openai, should use custom api base
-                openai_api_base = get_settings().get("OPENAI.API_BASE", None)
-                if openai_api_base is None or len(openai_api_base) == 0:
-                    self._chat = ChatOpenAI(openai_api_key=get_settings().openai.key)
-                else:
-                    self._chat = ChatOpenAI(openai_api_key=get_settings().openai.key, openai_api_base=openai_api_base)
-        except AttributeError as e:
-            if getattr(e, "name"):
-                raise ValueError(f"OpenAI {e.name} is required") from e
-            else:
-                raise e
+
+        # Create a default unused chat object to trigger early validation
+        self._create_chat(self.deployment_id)
 
     def chat(self, messages: list, model: str, temperature: float):
-        if self.azure:
-            # we must set the deployment_id only here (instead of the __init__ method) to support fallback_deployments
-            return self._chat.invoke(input = messages, model=model, temperature=temperature, deployment_name=self.deployment_id)
-        else:
-            return self._chat.invoke(input = messages, model=model, temperature=temperature)
+        chat = self._create_chat(self.deployment_id)
+        return chat.invoke(input=messages, model=model, temperature=temperature)
 
     @property
     def deployment_id(self):
@@ -71,3 +49,28 @@ async def chat_completion(self, model: str, system: str, user: str, temperature:
         except (Exception) as e:
             get_logger().error("Unknown error during OpenAI inference: ", e)
             raise e
+
+    def _create_chat(self, deployment_id=None):
+        try:
+            if self.azure:
+                # using a partial function so we can set the deployment_id later to support fallback_deployments
+                # but still need to access the other settings now so we can raise a proper exception if they're missing
+                return AzureChatOpenAI(
+                    openai_api_key=get_settings().openai.key,
+                    openai_api_version=get_settings().openai.api_version,
+                    azure_deployment=deployment_id,
+                    azure_endpoint=get_settings().openai.api_base,
+                )
+            else:
+                # for llms that compatible with openai, should use custom api base
+                openai_api_base = get_settings().get("OPENAI.API_BASE", None)
+                if openai_api_base is None or len(openai_api_base) == 0:
+                    return ChatOpenAI(openai_api_key=get_settings().openai.key)
+                else:
+                    return ChatOpenAI(openai_api_key=get_settings().openai.key, openai_api_base=openai_api_base)
+        except AttributeError as e:
+            if getattr(e, "name"):
+                raise ValueError(f"OpenAI {e.name} is required") from e
+            else:
+                raise e
+
diff --git a/requirements.txt b/requirements.txt
index f9c976f15..4337fe344 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,4 +30,6 @@ gunicorn==20.1.0
 # pinecone-datasets @ git+https://github.com/mrT23/pinecone-datasets.git@main
 # lancedb==0.5.1
 # uncomment this to support language LangChainOpenAIHandler
-# langchain==0.0.349
+# langchain==0.2.0
+# langchain-core==0.2.28
+# langchain-openai==0.1.20