diff --git a/pyproject.toml b/pyproject.toml
index 1cd4d683d..3ea51eaab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ requires-python = ">=3.9"
 license = "MIT"
 authors = [{ name = "OpenAI", email = "support@openai.com" }]
 dependencies = [
-    "openai>=1.97.1,<2",
+    "openai>=1.99.2,<2",
     "pydantic>=2.10, <3",
     "griffe>=1.5.6, <2",
     "typing-extensions>=4.12.2, <5",
diff --git a/src/agents/extensions/models/litellm_model.py b/src/agents/extensions/models/litellm_model.py
index b01b84253..d73e1817d 100644
--- a/src/agents/extensions/models/litellm_model.py
+++ b/src/agents/extensions/models/litellm_model.py
@@ -24,7 +24,7 @@
     AnnotationURLCitation,
     ChatCompletionMessage,
 )
-from openai.types.chat.chat_completion_message_tool_call import Function
+from openai.types.chat.chat_completion_message_function_tool_call import ChatCompletionMessageFunctionToolCall
 from openai.types.responses import Response
 
 from ... import _debug
@@ -416,7 +416,7 @@ def convert_tool_call_to_openai(
         return ChatCompletionMessageToolCall(
             id=tool_call.id,
             type="function",
-            function=Function(
+            function=ChatCompletionMessageFunctionToolCall(
                 name=tool_call.function.name or "", arguments=tool_call.function.arguments
             ),
         )