Temporarily cap orjson dependency.
diff --git a/sdks/python/setup.py b/sdks/python/setup.py
index 042d165..5a43740 100644
--- a/sdks/python/setup.py
+++ b/sdks/python/setup.py
@@ -230,7 +230,7 @@
                             language_level=3),
       install_requires=[
           'crcmod>=1.7,<2.0',
-          'orjson<4.0',
+          'orjson<3.9.2',  # https://github.com/ijl/orjson/issues/415
           # Dill doesn't have forwards-compatibility guarantees within minor
           # version. Pickles created with a new version of dill may not unpickle
           # using older version of dill. It is best to use the same version of