diff --git a/pyproject.toml b/pyproject.toml
index 3666988..220dda5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,6 +6,7 @@ readme = "README.md"
 
 dependencies = [
     "sigtools==4.0.1",
+    "typing_extensions>=4.6",
 ]
 requires-python = ">=3.8"
 
diff --git a/synchronicity/combined_types.py b/synchronicity/combined_types.py
index 5568323..d6bcb09 100644
--- a/synchronicity/combined_types.py
+++ b/synchronicity/combined_types.py
@@ -56,14 +56,10 @@ def __get__(self, instance, owner=None):
 
 
 class AsyncAndBlockingContextManager(typing_extensions.Protocol[CTX]):
-    def __enter__(self) -> CTX:
-        ...
+    def __enter__(self) -> CTX: ...
 
-    async def __aenter__(self) -> CTX:
-        ...
+    async def __aenter__(self) -> CTX: ...
 
-    def __exit__(self, typ, value, tb):
-        ...
+    def __exit__(self, typ, value, tb): ...
 
-    async def __aexit__(self, typ, value, tb):
-        ...
+    async def __aexit__(self, typ, value, tb): ...
diff --git a/synchronicity/overload_tracking.py b/synchronicity/overload_tracking.py
index 1ebd5df..db97a4c 100644
--- a/synchronicity/overload_tracking.py
+++ b/synchronicity/overload_tracking.py
@@ -19,6 +19,7 @@ def foo(a: typing.Union[bool, int]) -> typing.Union[bool, float]:
 # in the order they are declared
 foo_overloads = get_overloads(foo)
 """
+
 import contextlib
 import typing
 from unittest import mock
diff --git a/synchronicity/type_stubs.py b/synchronicity/type_stubs.py
index 1f68330..cbd8a98 100644
--- a/synchronicity/type_stubs.py
+++ b/synchronicity/type_stubs.py
@@ -5,6 +5,7 @@
   implementation types directly (but translated to blocking).
 * Let synchronicity emit actual function bodies, to avoid runtime wrapping altogether
 """
+
 import collections
 import collections.abc
 import contextlib
diff --git a/test/type_stub_test.py b/test/type_stub_test.py
index 6a57f25..311ed8d 100644
--- a/test/type_stub_test.py
+++ b/test/type_stub_test.py
@@ -379,8 +379,7 @@ def foo() -> typing.Callable[..., typing.Any]:
 
 
 def test_typing_literal():
-    def foo() -> typing.Literal["three", "str"]:
-        ...
+    def foo() -> typing.Literal["three", "str"]: ...
 
     src = _function_source(foo)
     assert "-> typing.Literal['three', 'str']" in src  # "str" should not be eval:ed in a Literal!