diff --git a/demo/requirements.txt b/demo/requirements.txt
index 49895c26c..d24d37e96 100644
--- a/demo/requirements.txt
+++ b/demo/requirements.txt
@@ -1,2 +1,3 @@
+pydantic<2.0.0
 git+https://github.com/aphp/edsnlp.git
 streamlit