diff --git a/docs/changelog.rst b/docs/changelog.rst
index f8cd444..1d0ddf2 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -9,7 +9,7 @@ Changelog
 0.11.0 (2024-04-12)
 -------------------
 
-- Switch to the ``whenever`` package for date/time types, instead of Arrow. See 
+- Switch to the ``whenever`` package for date/time types, instead of Arrow. See
   https://dev.arie.bovenberg.net/blog/python-datetime-pitfalls/ for more information as to why.
 - ``pg-purepy`` now passes Pyright strict mode.
 - :class:`.Converter` is now a generic type.
diff --git a/docs/conversion.rst b/docs/conversion.rst
index c942f9c..80b0233 100644
--- a/docs/conversion.rst
+++ b/docs/conversion.rst
@@ -35,7 +35,7 @@ Date/Time types
 
 .. note::
 
-    I use Whenever over the vanilla ``datetime`` objects because I don't like ``datetime``. Write 
+    I use Whenever over the vanilla ``datetime`` objects because I don't like ``datetime``. Write
     your own converter if you disagree with me.
 
 Enumeration types
diff --git a/src/pg_purepy/connection.py b/src/pg_purepy/connection.py
index 8dd44b6..9624dff 100644
--- a/src/pg_purepy/connection.py
+++ b/src/pg_purepy/connection.py
@@ -6,6 +6,7 @@
 
 import types
 import warnings
+from asyncio import lowlevel
 from collections.abc import AsyncGenerator, AsyncIterator, Mapping
 from contextlib import aclosing, asynccontextmanager
 from os import PathLike, fspath
@@ -187,7 +188,7 @@ async def _read_until_ready(
         """
 
         if self._protocol.ready:
-            await anyio.sleep(0)
+            await lowlevel.checkpoint()
             return
 
         while True:
@@ -210,7 +211,7 @@ async def _read_until_ready(
                 yield next_event
 
                 if isinstance(next_event, ReadyForQuery):
-                    await anyio.sleep(0)  # checkpoint()
+                    await lowlevel.checkpoint()  # checkpoint()
                     return
 
             to_send = self._protocol.get_needed_synchronisation()
@@ -288,13 +289,11 @@ async def lowlevel_query(
             if not self._protocol.ready:
                 await self.wait_until_ready()
 
-            simple_query = all(
-                (
-                    not (params or kwargs),
-                    not isinstance(query, PreparedStatementInfo),
-                    max_rows is None,
-                )
-            )
+            simple_query = all((
+                not (params or kwargs),
+                not isinstance(query, PreparedStatementInfo),
+                max_rows is None,
+            ))
 
             logger.debug("Executing query", query=query)
             if simple_query:
@@ -527,7 +526,7 @@ async def row_count(self) -> int:
         """
 
         if self._row_count >= 0:
-            await anyio.sleep(0)  # checkpoint
+            await lowlevel.checkpoint()  # checkpoint
             return self._row_count
 
         async for _ in self: