diff --git a/src/emevo/env.py b/src/emevo/env.py
index baa2e34d..eefb624a 100644
--- a/src/emevo/env.py
+++ b/src/emevo/env.py
@@ -93,8 +93,7 @@ def init_uniqueid(n: int, max_n: int) -> UniqueID:
 class ObsProtocol(Protocol):
     """Abstraction for agent's observation"""
 
-    def as_array(self) -> jax.Array:
-        ...
+    def as_array(self) -> jax.Array: ...
 
 
 OBS = TypeVar("OBS", bound="ObsProtocol")
@@ -109,8 +108,7 @@ class StateProtocol(Protocol):
     status: Status
     n_born_agents: jax.Array
 
-    def is_extinct(self) -> bool:
-        ...
+    def is_extinct(self) -> bool: ...
 
 
 STATE = TypeVar("STATE", bound="StateProtocol")
diff --git a/src/emevo/environments/env_utils.py b/src/emevo/environments/env_utils.py
index 971c5291..12b9922f 100644
--- a/src/emevo/environments/env_utils.py
+++ b/src/emevo/environments/env_utils.py
@@ -48,8 +48,7 @@ def get_slice(self, index: int) -> Self:
 class ReprNumFn(Protocol):
     initial: int
 
-    def __call__(self, n_steps: int, state: FoodNumState) -> FoodNumState:
-        ...
+    def __call__(self, n_steps: int, state: FoodNumState) -> FoodNumState: ...
 
 
 @dataclasses.dataclass(frozen=True)
@@ -176,16 +175,13 @@ def __call__(self, *args: Any, **kwargs: Any) -> tuple[ReprNumFn, FoodNumState]:
 
 
 class Coordinate(Protocol):
-    def bbox(self) -> tuple[tuple[float, float], tuple[float, float]]:
-        ...
+    def bbox(self) -> tuple[tuple[float, float], tuple[float, float]]: ...
 
     def contains_circle(
         self, center: jax.Array, radius: jax.Array | float
-    ) -> jax.Array:
-        ...
+    ) -> jax.Array: ...
 
-    def uniform(self, key: chex.PRNGKey) -> jax.Array:
-        ...
+    def uniform(self, key: chex.PRNGKey) -> jax.Array: ...
 
 
 @dataclasses.dataclass
diff --git a/src/emevo/environments/phyjax2d.py b/src/emevo/environments/phyjax2d.py
index 547fb6b0..cde2f396 100644
--- a/src/emevo/environments/phyjax2d.py
+++ b/src/emevo/environments/phyjax2d.py
@@ -99,8 +99,7 @@ class _PositionLike(Protocol):
     angle: jax.Array  # Angular velocity (N,)
     xy: jax.Array  # (N, 2)
 
-    def __init__(self, angle: jax.Array, xy: jax.Array) -> None:
-        ...
+    def __init__(self, angle: jax.Array, xy: jax.Array) -> None: ...
 
     def batch_size(self) -> int:
         return self.angle.shape[0]
diff --git a/src/emevo/visualizer.py b/src/emevo/visualizer.py
index a1c863d8..3a9313df 100644
--- a/src/emevo/visualizer.py
+++ b/src/emevo/visualizer.py
@@ -13,8 +13,7 @@ def close(self) -> None:
         """Close this visualizer"""
         ...
 
-    def get_image(self) -> NDArray:
-        ...
+    def get_image(self) -> NDArray: ...
 
     def render(self, state: STATE, **kwargs) -> None:
         """Render image"""