diff --git a/pyproject.toml b/pyproject.toml
index a39e6678..1a58583d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ dependencies = [
   "pandas>=2.0.0",
   "pandas_path",
   "pqdm",
-  "pydantic",
+  "pydantic<2.0.0",
   "python-dotenv",
   "pytorch-lightning>=2.0.0",
   "pytorchvideo",