diff --git a/tools/get-upload-stats.py b/tools/get-upload-stats.py
index cf46e394..2a5547ab 100755
--- a/tools/get-upload-stats.py
+++ b/tools/get-upload-stats.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+from __future__ import annotations
+
 from collections import Counter
 from collections.abc import Iterator
 from datetime import datetime, time, timezone
@@ -8,13 +10,14 @@
 from pathlib import Path, PurePosixPath
 import re
 import subprocess
-from typing import Any, TextIO
+from typing import Annotated, Any, TextIO
 
 import click
 from datalad.support.annexrepo import AnnexRepo
 from dateutil.parser import parse
 from humanize import naturalsize
 from pydantic import BaseModel
+from pydantic.functional_serializers import PlainSerializer
 from ruamel.yaml import YAML  # type: ignore[attr-defined]
 
 log = logging.getLogger("get-upload-stats")
@@ -51,20 +54,20 @@ class CommitInfo(BaseModel):
     created: datetime
 
 
-class MetadataSummary(BaseModel):
-    specimens: set[str] | None
-    species: set[str] | None
-    modalities: set[str] | None
-    techniques: set[str] | None
-    anatomies: set[str]
+SortedSet = Annotated[set[str], PlainSerializer(lambda s: sorted(s))]
 
-    class Config:
-        json_encoders = {set: sorted}
+
+class MetadataSummary(BaseModel):
+    specimens: SortedSet | None
+    species: SortedSet | None
+    modalities: SortedSet | None
+    techniques: SortedSet | None
+    anatomies: SortedSet
 
     @classmethod
     def from_metadata(
         cls, dandiset_metadata: dict, asset_metadata: list[dict] | None
-    ) -> "MetadataSummary":
+    ) -> MetadataSummary:
         specimens: set[str] | None
         if asset_metadata is not None:
             specimens = {sp for am in asset_metadata for sp in cls.get_specimens(am)}
@@ -144,7 +147,7 @@ def cmp(one: set[str] | None, two: set[str] | None) -> SetAddedRemoved | None:
         return cls(
             **{
                 k: cmp(getattr(first, k), getattr(second, k))
-                for k in cls.__fields__.keys()
+                for k in cls.model_fields.keys()
             }
         )
 
@@ -572,7 +575,7 @@ def main(
         since_latest=since_latest,
     )
     if fmt == "json":
-        print(report.json(indent=4), file=outfile)
+        print(report.model_dump_json(indent=4), file=outfile)
     elif fmt == "yaml":
         yaml = YAML(typ="safe")
         yaml.default_flow_style = False
diff --git a/tools/get-upload-stats.req.txt b/tools/get-upload-stats.req.txt
index b3a6beb5..c56cd18d 100644
--- a/tools/get-upload-stats.req.txt
+++ b/tools/get-upload-stats.req.txt
@@ -2,6 +2,6 @@
 click >= 8.0
 datalad
 humanize
-pydantic ~= 1.7
+pydantic ~= 2.0
 python-dateutil ~= 2.0
 ruamel.yaml ~= 0.15
diff --git a/tools/setup.cfg b/tools/setup.cfg
index b88ef4ef..1f3a3244 100644
--- a/tools/setup.cfg
+++ b/tools/setup.cfg
@@ -19,4 +19,3 @@ ignore_missing_imports = True
 
 [pydantic-mypy]
 init_forbid_extra = True
-warn_untypes_fields = True