diff --git a/databases/backends/postgres.py b/databases/backends/postgres.py
index 3d0a36f2..3e1a6fff 100644
--- a/databases/backends/postgres.py
+++ b/databases/backends/postgres.py
@@ -1,6 +1,5 @@
 import logging
 import typing
-from collections.abc import Sequence
 
 import asyncpg
 from sqlalchemy.dialects.postgresql import pypostgresql
diff --git a/databases/core.py b/databases/core.py
index 7005281c..8f7df452 100644
--- a/databases/core.py
+++ b/databases/core.py
@@ -11,12 +11,7 @@
 from sqlalchemy.sql import ClauseElement
 
 from databases.importer import import_from_string
-from databases.interfaces import (
-    ConnectionBackend,
-    DatabaseBackend,
-    Record,
-    TransactionBackend,
-)
+from databases.interfaces import DatabaseBackend, Record
 
 if sys.version_info >= (3, 7):  # pragma: no cover
     import contextvars as contextvars