diff --git a/singer_sdk/connectors/sql.py b/singer_sdk/connectors/sql.py
index 3174d8ef5..c6f957589 100644
--- a/singer_sdk/connectors/sql.py
+++ b/singer_sdk/connectors/sql.py
@@ -59,7 +59,7 @@ def __init__(
         self._config: dict[str, t.Any] = config or {}
         self._sqlalchemy_url: str | None = sqlalchemy_url or None
         self._table_cols_cache: dict[str, dict[str, sqlalchemy.Column]] = {}
-        self._schema_cache: t.Set[str] = set()
+        self._schema_cache: set[str] = set()
 
     @property
     def config(self) -> dict:
@@ -588,7 +588,7 @@ def schema_exists(self, schema_name: str) -> bool:
         """
         if schema_name not in self._schema_cache:
             self._schema_cache = set(
-                sqlalchemy.inspect(self._engine).get_schema_names()
+                sqlalchemy.inspect(self._engine).get_schema_names(),
             )
 
         return schema_name in self._schema_cache