diff --git a/cirrocumulus/util.py b/cirrocumulus/util.py
index 113a8dd8..680eeea3 100644
--- a/cirrocumulus/util.py
+++ b/cirrocumulus/util.py
@@ -4,16 +4,11 @@
 import fsspec
 import numpy as np
 import pandas as pd
-import pandas._libs.json as ujson
 from flask import make_response
+from pandas.io.json import ujson_dumps
 
 from cirrocumulus.envir import CIRRO_DATASET_PROVIDERS
 
-try:
-    _dumps = ujson.dumps
-except AttributeError:
-    _dumps = ujson.ujson_dumps
-
 
 def to_json_array(values):
     """Coerce a pandas array to something the JSON encoder can walk.
@@ -32,7 +27,7 @@ def dumps(data, **kwargs):
         data = {k: to_json_array(v) for k, v in data.items()}
     else:
         data = to_json_array(data)
-    return _dumps(data, **kwargs)
+    return ujson_dumps(data, **kwargs)
 
 
 def add_dataset_providers():
diff --git a/pyproject.toml b/pyproject.toml
index e4dda5fb..4b7c4e3a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ dependencies = [
     "fsspec",
     "gunicorn",
     "numpy",
-    "pandas",
+    "pandas>=2.2",
     "pymongo",
     "requests",
     "scipy",