diff --git a/tap_postgres/client.py b/tap_postgres/client.py
index a6ae564c..3572a0f5 100644
--- a/tap_postgres/client.py
+++ b/tap_postgres/client.py
@@ -10,7 +10,6 @@
 import json
 import select
 import typing as t
-from functools import cached_property
 from types import MappingProxyType
 from typing import TYPE_CHECKING, Any
 
@@ -30,7 +29,6 @@
     from collections.abc import Iterable, Mapping
 
     from singer_sdk.helpers.types import Context
-    from sqlalchemy.dialects import postgresql
     from sqlalchemy.engine import Engine
     from sqlalchemy.engine.reflection import Inspector
 
@@ -44,7 +42,12 @@ def __init__(self, dates_as_string: bool, json_as_object: bool, *args, **kwargs)
         self.dates_as_string = dates_as_string
         self.json_as_object = json_as_object
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @functools.singledispatchmethod
+    def to_jsonschema(self, column_type: Any) -> dict:
+        """Customize the JSON Schema for Postgres types."""
+        return super().to_jsonschema(column_type)
+
+    @to_jsonschema.register
     def array_to_jsonschema(self, column_type: postgresql.ARRAY) -> dict:
         """Override the default mapping for NUMERIC columns.
 
@@ -55,21 +58,21 @@ def array_to_jsonschema(self, column_type: postgresql.ARRAY) -> dict:
             "items": self.to_jsonschema(column_type.item_type),
         }
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @to_jsonschema.register
     def json_to_jsonschema(self, column_type: postgresql.JSON) -> dict:
         """Override the default mapping for JSON and JSONB columns."""
         if self.json_as_object:
             return {"type": ["object", "null"]}
         return {"type": ["string", "number", "integer", "array", "object", "boolean"]}
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @to_jsonschema.register
     def datetime_to_jsonschema(self, column_type: sqlalchemy.types.DateTime) -> dict:
         """Override the default mapping for DATETIME columns."""
         if self.dates_as_string:
             return {"type": ["string", "null"]}
         return super().datetime_to_jsonschema(column_type)
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @to_jsonschema.register
     def date_to_jsonschema(self, column_type: sqlalchemy.types.Date) -> dict:
         """Override the default mapping for DATE columns."""
         if self.dates_as_string:
@@ -276,7 +279,7 @@ def config(self) -> Mapping[str, Any]:
         """Return a read-only config dictionary."""
         return MappingProxyType(self._config)
 
-    @cached_property
+    @functools.cached_property
     def schema(self) -> dict:
         """Override schema for log-based replication adding _sdc columns."""
         schema_dict = t.cast(dict, self._singer_catalog_entry.schema.to_dict())