diff --git a/server/common/pydantic_model.py b/server/common/pydantic_model.py
index 7dc0be70..f6801904 100644
--- a/server/common/pydantic_model.py
+++ b/server/common/pydantic_model.py
@@ -4,5 +4,4 @@
 class BaseModel(pydantic.BaseModel):
     """Base immutable model for our internal use."""
 
-    class Config(object):
-        frozen = True
+    model_config = pydantic.ConfigDict(frozen=True)