diff --git a/choreographer/browser_async.py b/choreographer/browser_async.py
index f8d78a2a..2b272597 100644
--- a/choreographer/browser_async.py
+++ b/choreographer/browser_async.py
@@ -24,7 +24,9 @@
     from collections.abc import Generator, MutableMapping
     from pathlib import Path
     from types import TracebackType
-    from typing import Any, Self
+    from typing import Any
+
+    from typing_extensions import Self  # 3.9 needs this, could be from typing in 3.10
 
     from .browsers._interface_type import BrowserImplInterface
     from .channels._interface_type import ChannelInterface
diff --git a/choreographer/browser_sync.py b/choreographer/browser_sync.py
index 27dcf0ad..cfa271ba 100644
--- a/choreographer/browser_sync.py
+++ b/choreographer/browser_sync.py
@@ -19,7 +19,9 @@
     from collections.abc import MutableMapping
     from pathlib import Path
     from types import TracebackType
-    from typing import Any, Self
+    from typing import Any
+
+    from typing_extensions import Self  # 3.9 needs this, could be from typing in 3.10
 
     from .browsers._interface_type import BrowserImplInterface
     from .channels._interface_type import ChannelInterface
diff --git a/choreographer/channels/pipe.py b/choreographer/channels/pipe.py
index 7384fd06..e500dde8 100644
--- a/choreographer/channels/pipe.py
+++ b/choreographer/channels/pipe.py
@@ -70,7 +70,7 @@ def write_json(self, obj: Mapping[str, Any]) -> None:
         if self.shutdown_lock.locked():
             raise ChannelClosedError
         encoded_message = wire.serialize(obj) + b"\0"
-        _logger.debug2(f"Writing: {encoded_message}")
+        _logger.debug2(f"Writing: {encoded_message!r}")
         try:
             os.write(self._write_to_browser, encoded_message)
         except OSError as e:
@@ -112,7 +112,7 @@ def read_jsons(  # noqa: PLR0912, C901 branches, complexity
                 self._read_from_browser,
                 10000,
             )  # 10MB buffer, nbd, doesn't matter w/ this
-            _logger.debug2(f"Read: {raw_buffer}")
+            _logger.debug2(f"Read: {raw_buffer!r}")
             if not raw_buffer or raw_buffer == b"{bye}\n":
                 # we seem to need {bye} even if chrome closes NOTE
                 raise ChannelClosedError
@@ -121,7 +121,7 @@ def read_jsons(  # noqa: PLR0912, C901 branches, complexity
                 if _with_block:
                     os.set_blocking(self._read_from_browser, True)
                 raw_buffer += os.read(self._read_from_browser, 10000)
-                _logger.debug2(f"Read: {raw_buffer}")
+                _logger.debug2(f"Read: {raw_buffer!r}")
         except BlockingIOError:
             return jsons
         except OSError as e:
diff --git a/choreographer/cli/_cli_utils_no_qa.py b/choreographer/cli/_cli_utils_no_qa.py
index ae374e88..78d9506b 100644
--- a/choreographer/cli/_cli_utils_no_qa.py
+++ b/choreographer/cli/_cli_utils_no_qa.py
@@ -107,7 +107,11 @@ def diagnose() -> None:
         for exception in fail:
             try:
                 print(f"Error in: {exception[0]}")
-                traceback.print_exception(exception[1])
+                traceback.print_exception(
+                    type(exception[1]),
+                    exception[1],
+                    exception[1].__traceback__,
+                )
             except BaseException:
                 print("Couldn't print traceback for:")
                 print(str(exception))
diff --git a/choreographer/protocol/__init__.py b/choreographer/protocol/__init__.py
index 7556f8cc..fa76b712 100644
--- a/choreographer/protocol/__init__.py
+++ b/choreographer/protocol/__init__.py
@@ -8,14 +8,14 @@
 
 from collections.abc import MutableMapping
 from enum import Enum
-from typing import Any, NewType, cast
+from typing import Any, NewType, Optional, cast
 
 BrowserResponse = NewType("BrowserResponse", MutableMapping[str, Any])
 """The type for a response from the browser. Is really a `dict()`."""
 BrowserCommand = NewType("BrowserCommand", MutableMapping[str, Any])
 """The type for a command to the browser. Is really a `dict()`."""
 
-MessageKey = NewType("MessageKey", tuple[str, int | None])
+MessageKey = NewType("MessageKey", tuple[str, Optional[int]])
 """The type for id'ing a message/response. It is `tuple(session_id, message_id)`."""
 
 
diff --git a/choreographer/utils/_tmpfile.py b/choreographer/utils/_tmpfile.py
index d336ca14..339ab05d 100644
--- a/choreographer/utils/_tmpfile.py
+++ b/choreographer/utils/_tmpfile.py
@@ -64,13 +64,13 @@ def __init__(self, path: str | None = None, *, sneak: bool = False):
         else:  # is windows
             vinfo = sys.version_info[:3]
             if vinfo >= (3, 12):
-                self.temp_dir = tempfile.TemporaryDirectory(
+                self.temp_dir = tempfile.TemporaryDirectory(  # type: ignore [call-overload, unused-ignore]
                     delete=False,
                     ignore_cleanup_errors=True,
                     **args,
                 )
             elif vinfo >= (3, 10):
-                self.temp_dir = tempfile.TemporaryDirectory(
+                self.temp_dir = tempfile.TemporaryDirectory(  # type: ignore [call-overload, unused-ignore]
                     ignore_cleanup_errors=True,
                     **args,
                 )
@@ -170,7 +170,7 @@ def remove_readonly(
 
         try:
             if self._with_onexc:
-                shutil.rmtree(self.path, onexc=remove_readonly)
+                shutil.rmtree(self.path, onexc=remove_readonly)  # type: ignore [call-arg, unused-ignore]
             else:
                 shutil.rmtree(self.path, onerror=remove_readonly)
             self.exists = False