diff --git a/api/python/setup.py b/api/python/setup.py
index 7836698666c..582f8a5ce3d 100644
--- a/api/python/setup.py
+++ b/api/python/setup.py
@@ -66,6 +66,7 @@ def run(self):
         'tqdm>=4.32',
         'requests_futures==1.0.0',
         'jsonschema>=3,<5',
+        'pydantic',  # XXX: set version
     ],
     extras_require={
         'pyarrow': [