diff --git a/requirements-dev.txt b/requirements-dev.txt
index 726f2b77..66e0312d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -4,7 +4,7 @@
 #
 #    pip-compile --output-file=requirements-dev.txt requirements-dev.in
 #
-black==23.11.0
+black==24.3.0
     # via -r requirements-dev.in
 click==8.1.7
     # via black
diff --git a/src/ufoLib2/objects/contour.py b/src/ufoLib2/objects/contour.py
index 32b7cdaf..764ab056 100644
--- a/src/ufoLib2/objects/contour.py
+++ b/src/ufoLib2/objects/contour.py
@@ -54,8 +54,7 @@ def __delitem__(self, index: int | slice) -> None:
         del self.points[index]
 
     @overload
-    def __getitem__(self, index: int) -> Point:
-        ...
+    def __getitem__(self, index: int) -> Point: ...
 
     @overload
     def __getitem__(self, index: slice) -> list[Point]:  # noqa: F811
diff --git a/src/ufoLib2/objects/info/woff.py b/src/ufoLib2/objects/info/woff.py
index ac40e37a..aa328b70 100644
--- a/src/ufoLib2/objects/info/woff.py
+++ b/src/ufoLib2/objects/info/woff.py
@@ -2,6 +2,7 @@
 
 https://unifiedfontobject.org/versions/ufo3/fontinfo.plist/#woff-data
 """
+
 from __future__ import annotations
 
 from typing import Any, List, Mapping, Optional, Sequence, Type, TypeVar
diff --git a/src/ufoLib2/objects/layer.py b/src/ufoLib2/objects/layer.py
index 35febb8d..faf227ae 100644
--- a/src/ufoLib2/objects/layer.py
+++ b/src/ufoLib2/objects/layer.py
@@ -228,12 +228,10 @@ def keys(self) -> KeysView[str]:
         return self._glyphs.keys()
 
     @overload
-    def pop(self, key: str) -> Glyph:
-        ...
+    def pop(self, key: str) -> Glyph: ...
 
     @overload
-    def pop(self, key: str, default: Glyph | T = ...) -> Glyph | T:
-        ...
+    def pop(self, key: str, default: Glyph | T = ...) -> Glyph | T: ...
 
     def pop(self, key: str, default: Glyph | T = KeyError) -> Glyph | T:  # type: ignore
         """Remove and return glyph from layer.
diff --git a/src/ufoLib2/typing.py b/src/ufoLib2/typing.py
index 2747ba7c..242e1719 100644
--- a/src/ufoLib2/typing.py
+++ b/src/ufoLib2/typing.py
@@ -19,8 +19,7 @@ class Drawable(Protocol):
     See :mod:`fontTools.pens.basePen` for an introduction to pens.
     """
 
-    def draw(self, pen: AbstractPen) -> None:
-        ...
+    def draw(self, pen: AbstractPen) -> None: ...
 
 
 class DrawablePoints(Protocol):
@@ -29,8 +28,7 @@ class DrawablePoints(Protocol):
     See :mod:`fontTools.pens.pointPen` for an introduction to point pens.
     """
 
-    def drawPoints(self, pen: AbstractPointPen) -> None:
-        ...
+    def drawPoints(self, pen: AbstractPointPen) -> None: ...
 
 
 class HasIdentifier(Protocol):
@@ -54,8 +52,6 @@ class GlyphSet(Protocol):
     """
 
     # "object" instead of "str" because that's what typeshed says a Mapping should have.
-    def __contains__(self, name: object) -> bool:
-        ...
+    def __contains__(self, name: object) -> bool: ...
 
-    def __getitem__(self, name: str) -> Drawable | DrawablePoints:
-        ...
+    def __getitem__(self, name: str) -> Drawable | DrawablePoints: ...