diff --git a/pyproject.toml b/pyproject.toml
index 1a140ce..8ac1b7e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ requires = [
     "msgpack",
     "quart",
     "numba",
+    "opencv-python-headless<=4.11.0.86", # Required to avoid numpy version conflict with vllm
 ]
 build-backend = "setuptools.build_meta"
 
diff --git a/requirements.txt b/requirements.txt
index 7808e85..d32d475 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,6 +13,7 @@ setuptools-scm>=8
 torch>=2.7.1
 torchvision
 wheel
+opencv-python-headless<=4.11.0.86 # Required to avoid numpy version conflict with vllm
 
 # requirements for disaggregated prefill
 msgpack