diff --git a/flake.lock b/flake.lock
index 8e03912..7ed07fe 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1707451808,
-        "narHash": "sha256-UwDBUNHNRsYKFJzyTMVMTF5qS4xeJlWoeyJf+6vvamU=",
+        "lastModified": 1711231723,
+        "narHash": "sha256-dARJQ8AJOv6U+sdRePkbcVyVbXJTi1tReCrkkOeusiA=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "442d407992384ed9c0e6d352de75b69079904e4e",
+        "rev": "e1d501922fd7351da4200e1275dfcf5faaad1220",
         "type": "github"
       },
       "original": {
diff --git a/pyproject.toml b/pyproject.toml
index c3644e3..42329fd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ requires-python = ">= 3.11"
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
-[tool.ruff]
+[tool.ruff.lint]
 select = ["E", "F", "I", "UP"]
 ignore = []
 
diff --git a/src/zen_mapper/cluster.py b/src/zen_mapper/cluster.py
index 223d889..f9701a1 100644
--- a/src/zen_mapper/cluster.py
+++ b/src/zen_mapper/cluster.py
@@ -14,8 +14,7 @@ class Clusterer(Protocol):
     iterator of arrays of indices into that array which are disjoint.
     """
 
-    def __call__(self, data: np.ndarray) -> Iterator[np.ndarray]:
-        ...
+    def __call__(self, data: np.ndarray) -> Iterator[np.ndarray]: ...
 
 
 class sk_learn:
diff --git a/src/zen_mapper/cover.py b/src/zen_mapper/cover.py
index adeabbc..b11e563 100644
--- a/src/zen_mapper/cover.py
+++ b/src/zen_mapper/cover.py
@@ -8,16 +8,13 @@
 
 
 class Cover(Protocol):
-    def __len__(self: Self) -> int:
-        ...
+    def __len__(self: Self) -> int: ...
 
-    def __iter__(self: Self) -> Iterator[np.ndarray]:
-        ...
+    def __iter__(self: Self) -> Iterator[np.ndarray]: ...
 
 
 class CoverScheme(Protocol):
-    def __call__(self: Self, data: np.ndarray) -> Cover:
-        ...
+    def __call__(self: Self, data: np.ndarray) -> Cover: ...
 
 
 def rectangular_cover(centers, widths, data, tol=1e-9):