diff --git a/tests/entrypoints/openai/test_serving_chat.py b/tests/entrypoints/openai/test_serving_chat.py
index 1d96b05ac..33c69578c 100644
--- a/tests/entrypoints/openai/test_serving_chat.py
+++ b/tests/entrypoints/openai/test_serving_chat.py
@@ -126,7 +126,7 @@ def gptoss_speculative_server(default_server_args: list[str]):
     if is_aiter_found_and_supported():
         env_dict = {"VLLM_ROCM_USE_AITER": "1"}
     with RemoteOpenAIServer(
-        GPT_OSS_MODEL_NAME, server_args, env_dict=env_dict
+        GPT_OSS_MODEL_NAME, server_args, env_dict=env_dict, max_wait_seconds=480
     ) as remote_server:
         yield remote_server
 
diff --git a/tests/utils.py b/tests/utils.py
index 5252115f2..9ab6df9e2 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -190,7 +190,7 @@ class RemoteOpenAIServer:
             model_loader.download_model(model_config)
 
         self._start_server(model, vllm_serve_args, env_dict)
-        max_wait_seconds = max_wait_seconds or 240
+        max_wait_seconds = max_wait_seconds or 360
         self._wait_for_server(url=self.url_for("health"), timeout=max_wait_seconds)
 
     def __enter__(self):