diff --git a/requirements.txt b/requirements.txt
index 4acd40927237..4462ef3615c9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,5 +8,5 @@ transformers >= 4.28.0  # Required for LLaMA.
 xformers >= 0.0.19
 fastapi
 uvicorn
-pydantic  # Required for OpenAI server.
+pydantic < 2  # Required for OpenAI server.
 fschat  # Required for OpenAI ChatCompletion Endpoint.