diff --git a/python/pyproject.toml b/python/pyproject.toml
index 121d8e94b..16bccf2b0 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -19,7 +19,7 @@ dependencies = ["requests", "tqdm", "numpy", "IPython"]
 runtime_common = ["aiohttp", "decord", "fastapi", "hf_transfer", "huggingface_hub", "interegular",
     "orjson", "packaging", "pillow", "prometheus-client>=0.20.0", "psutil", "pydantic", "python-multipart",
     "torchao", "uvicorn", "uvloop", "pyzmq>=25.1.2",
-    "outlines>=0.0.44", "modelscope"]
+    "outlines>=0.0.44,<0.1.0", "modelscope"]
 srt = ["sglang[runtime_common]", "torch", "vllm==0.6.3.post1"]
 
 # HIP (Heterogeneous-computing Interface for Portability) for AMD