diff --git a/python-req.txt b/python-req.txt
index acc4867..e5cff05 100644
--- a/python-req.txt
+++ b/python-req.txt
@@ -2,4 +2,5 @@ vetiver==0.2.1
 scikit-learn
 pins
 pandas
+pydantic<2.0.0
 ipython