diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index cb0e4c3..b710cf7 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,25 +13,16 @@
 # limitations under the License.
 
 repos:
-  - repo: https://github.com/ambv/black
-    rev: 22.3.0
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.1.7
     hooks:
-    - id: black
-  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: 'v0.0.255'
-    hooks:
-      - id: ruff
-        args: [--fix]
+      - id: ruff  # linter
+        types_or: [ python, pyi, jupyter ]
+        args: [ --fix ]
+      - id: ruff-format  # formatter
+        types_or: [ python, pyi, jupyter ]
   - repo: https://github.com/RobertCraigie/pyright-python
     rev: v1.1.330
     hooks:
     - id: pyright
       additional_dependencies: ["equinox", "jax", "lineax", "pytest", "optax"]
-  - repo: https://github.com/nbQA-dev/nbQA
-    rev: 1.6.3
-    hooks:
-    - id: nbqa-black
-      additional_dependencies: [ipython==8.12, black]
-    - id: nbqa-ruff 
-      args: ["--ignore=I001"]
-      additional_dependencies: [ipython==8.12, ruff]
diff --git a/benchmarks/levenberg-marquardt.py b/benchmarks/levenberg-marquardt.py
index 5ce98f7..2181fdb 100644
--- a/benchmarks/levenberg-marquardt.py
+++ b/benchmarks/levenberg-marquardt.py
@@ -44,9 +44,8 @@
 import jax.scipy as jsp
 import jaxopt  # pyright: ignore
 import lineax as lx
-from jaxtyping import Array, Float
-
 import optimistix as optx
+from jaxtyping import Array, Float
 
 
 def vector_field(
diff --git a/benchmarks/vmap-unroll.py b/benchmarks/vmap-unroll.py
index 9ea748b..bc53c14 100644
--- a/benchmarks/vmap-unroll.py
+++ b/benchmarks/vmap-unroll.py
@@ -22,7 +22,6 @@
 import jax.numpy as jnp
 import jax.random as jr
 import jaxopt  # pyright: ignore
-
 import optimistix as optx
 
 
diff --git a/docs/examples/custom_solver.ipynb b/docs/examples/custom_solver.ipynb
index 0dababc..699e59c 100644
--- a/docs/examples/custom_solver.ipynb
+++ b/docs/examples/custom_solver.ipynb
@@ -32,6 +32,7 @@
    "outputs": [],
    "source": [
     "from collections.abc import Callable\n",
+    "\n",
     "import optimistix as optx\n",
     "\n",
     "\n",
diff --git a/docs/examples/optimise_diffeq.ipynb b/docs/examples/optimise_diffeq.ipynb
index f2e3859..25b8bc8 100644
--- a/docs/examples/optimise_diffeq.ipynb
+++ b/docs/examples/optimise_diffeq.ipynb
@@ -25,10 +25,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import jax.numpy as jnp\n",
-    "import matplotlib.pyplot as plt\n",
     "import diffrax as dfx  # https://github.com/patrick-kidger/diffrax\n",
     "import equinox as eqx  # https://github.com/patrick-kidger/equinox\n",
+    "import jax.numpy as jnp\n",
+    "import matplotlib.pyplot as plt\n",
     "import optimistix as optx\n",
     "from jaxtyping import Array, Float  # https://github.com/google/jaxtyping"
    ]
diff --git a/docs/examples/root_find.ipynb b/docs/examples/root_find.ipynb
index 7e77fa6..7c4c724 100644
--- a/docs/examples/root_find.ipynb
+++ b/docs/examples/root_find.ipynb
@@ -23,6 +23,7 @@
     "import jax.numpy as jnp\n",
     "import optimistix as optx\n",
     "\n",
+    "\n",
     "# Often import when doing scientific work\n",
     "jax.config.update(\"jax_enable_x64\", True)\n",
     "\n",
diff --git a/optimistix/_ad.py b/optimistix/_ad.py
index b2c586c..2ea2a79 100644
--- a/optimistix/_ad.py
+++ b/optimistix/_ad.py
@@ -123,7 +123,7 @@ def _for_jvp(_diff):
     )
     _, jvp_diff = jax.jvp(_for_jvp, (diff,), (t_inputs,))
 
-    t_root = (-lx.linear_solve(operator, jvp_diff, linear_solver).value ** ω).ω
+    t_root = (-(lx.linear_solve(operator, jvp_diff, linear_solver).value ** ω)).ω
     t_residual = tree_full_like(residual, 0)
 
     return (root, residual), (t_root, t_residual)
diff --git a/optimistix/_fixed_point.py b/optimistix/_fixed_point.py
index 4ef4627..32086dc 100644
--- a/optimistix/_fixed_point.py
+++ b/optimistix/_fixed_point.py
@@ -73,7 +73,7 @@ def fixed_point(
     max_steps: Optional[int] = 256,
     adjoint: AbstractAdjoint = ImplicitAdjoint(),
     throw: bool = True,
-    tags: frozenset[object] = frozenset()
+    tags: frozenset[object] = frozenset(),
 ) -> Solution[Y, Aux]:
     """Find a fixed-point of a function.
 
diff --git a/optimistix/_iterate.py b/optimistix/_iterate.py
index a908479..bf49210 100644
--- a/optimistix/_iterate.py
+++ b/optimistix/_iterate.py
@@ -337,13 +337,16 @@ def iterative_solve(
     f_struct = jtu.tree_map(eqxi.Static, f_struct)
     aux_struct = jtu.tree_map(eqxi.Static, aux_struct)
     inputs = fn, solver, y0, args, options, max_steps, f_struct, aux_struct, tags
-    out, (
-        num_steps,
-        result,
-        dynamic_final_state,
-        static_state,
-        aux,
-        stats,
+    (
+        out,
+        (
+            num_steps,
+            result,
+            dynamic_final_state,
+            static_state,
+            aux,
+            stats,
+        ),
     ) = adjoint.apply(_iterate, rewrite_fn, inputs, tags)
     final_state = eqx.combine(dynamic_final_state, unwrap_jaxpr(static_state.value))
     stats = {"num_steps": num_steps, "max_steps": max_steps, **stats}
diff --git a/optimistix/_misc.py b/optimistix/_misc.py
index 1c80582..13e7bb2 100644
--- a/optimistix/_misc.py
+++ b/optimistix/_misc.py
@@ -49,7 +49,6 @@ def tree_full_like(
 def tree_full_like(
     struct: PyTree, fill_value: ArrayLike, allow_static: Literal[True] = True
 ):
-
     ...
 
 
diff --git a/optimistix/_solver/backtracking.py b/optimistix/_solver/backtracking.py
index bc3a70c..22e6a0d 100644
--- a/optimistix/_solver/backtracking.py
+++ b/optimistix/_solver/backtracking.py
@@ -79,7 +79,6 @@ def step(
         f_eval_info: _FnEvalInfo,
         state: _BacktrackingState,
     ) -> tuple[Scalar, Bool[Array, ""], RESULTS, _BacktrackingState]:
-
         if isinstance(
             f_info,
             (
diff --git a/optimistix/_solver/bfgs.py b/optimistix/_solver/bfgs.py
index 26a766c..3ba67d8 100644
--- a/optimistix/_solver/bfgs.py
+++ b/optimistix/_solver/bfgs.py
@@ -238,7 +238,9 @@ def accepted(descent_state):
                 f_eval, grad, state.f_info.grad, hessian, hessian_inv, y_diff
             )
             descent_state = self.descent.query(
-                state.y_eval, f_eval_info, descent_state  # pyright: ignore
+                state.y_eval,
+                f_eval_info,  # pyright: ignore
+                descent_state,
             )
             f_diff = (f_eval**ω - state.f_info.f**ω).ω
             terminate = cauchy_termination(
diff --git a/optimistix/_solver/dogleg.py b/optimistix/_solver/dogleg.py
index 45831a1..c41685c 100644
--- a/optimistix/_solver/dogleg.py
+++ b/optimistix/_solver/dogleg.py
@@ -13,14 +13,14 @@
 # limitations under the License.
 
 from collections.abc import Callable
-from typing import Any, Generic, Union
+from typing import Any, cast, Generic, Union
 
 import equinox as eqx
 import jax.lax as lax
 import jax.numpy as jnp
 import lineax as lx
 from equinox.internal import ω
-from jaxtyping import PyTree, Scalar
+from jaxtyping import Array, PyTree, Scalar
 
 from .._custom_types import Aux, Out, Y
 from .._misc import (
@@ -102,6 +102,7 @@ def query(
         safe_denom = jnp.where(denom_nonzero, denom, 1)
         # Compute `grad^T grad / (grad^T Hess grad)`
         scaling = jnp.where(denom_nonzero, sum_squares(f_info.grad) / safe_denom, 0.0)
+        scaling = cast(Array, scaling)
 
         # Downhill towards the bottom of the quadratic basin.
         newton_sol, result = newton_step(f_info, self.linear_solver)
diff --git a/pyproject.toml b/pyproject.toml
index 2cb4a95..9d0f3b9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,14 +46,17 @@ include = ["optimistix/*"]
 addopts = "--jaxtyping-packages=optimistix,beartype.beartype(conf=beartype.BeartypeConf(strategy=beartype.BeartypeStrategy.On))"
 
 [tool.ruff]
-select = ["E", "F", "I001"]
+extend-include = ["*.ipynb"]
+fixable = ["I001", "F401"]
 ignore = ["E402", "E721", "E731", "E741", "F722"]
 ignore-init-module-imports = true
+select = ["E", "F", "I001"]
+src = []
 
 [tool.ruff.isort]
 combine-as-imports = true
-lines-after-imports = 2
 extra-standard-library = ["typing_extensions"]
+lines-after-imports = 2
 order-by-type = false
 
 [tool.pyright]
diff --git a/tests/helpers.py b/tests/helpers.py
index 09a476b..7502a72 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -26,11 +26,10 @@
 import lineax as lx
 import numpy as np
 import optax
+import optimistix as optx
 from equinox.internal import ω
 from jaxtyping import Array, PyTree, Scalar
 
-import optimistix as optx
-
 
 Y = TypeVar("Y")
 Out = TypeVar("Out")
diff --git a/tests/test_best_so_far.py b/tests/test_best_so_far.py
index 41bb1cb..3697884 100644
--- a/tests/test_best_so_far.py
+++ b/tests/test_best_so_far.py
@@ -1,5 +1,4 @@
 import jax.numpy as jnp
-
 import optimistix as optx
 
 
diff --git a/tests/test_compat.py b/tests/test_compat.py
index 5486a2f..e1190e4 100644
--- a/tests/test_compat.py
+++ b/tests/test_compat.py
@@ -1,8 +1,7 @@
 import jax.numpy as jnp
 import jax.scipy.optimize as jsp_optimize
-import pytest
-
 import optimistix as optx
+import pytest
 
 from .helpers import beale, tree_allclose
 
diff --git a/tests/test_fixed_point.py b/tests/test_fixed_point.py
index 8784024..3d5c8c8 100644
--- a/tests/test_fixed_point.py
+++ b/tests/test_fixed_point.py
@@ -4,11 +4,10 @@
 import jax.numpy as jnp
 import jax.random as jr
 import jax.tree_util as jtu
+import optimistix as optx
 import pytest
 from equinox.internal import ω
 
-import optimistix as optx
-
 from .helpers import (
     bisection_fn_init_options_args,
     finite_difference_jvp,
diff --git a/tests/test_least_squares.py b/tests/test_least_squares.py
index a837a49..9c1a839 100644
--- a/tests/test_least_squares.py
+++ b/tests/test_least_squares.py
@@ -6,9 +6,8 @@
 import jax.random as jr
 import jax.tree_util as jtu
 import lineax as lx
-import pytest
-
 import optimistix as optx
+import pytest
 
 from .helpers import (
     diagonal_quadratic_bowl,
diff --git a/tests/test_minimise.py b/tests/test_minimise.py
index b7b64ca..99ff340 100644
--- a/tests/test_minimise.py
+++ b/tests/test_minimise.py
@@ -6,9 +6,8 @@
 import jax.random as jr
 import jax.tree_util as jtu
 import optax
-import pytest
-
 import optimistix as optx
+import pytest
 
 from .helpers import (
     beale,
diff --git a/tests/test_misc.py b/tests/test_misc.py
index b470500..80798a5 100644
--- a/tests/test_misc.py
+++ b/tests/test_misc.py
@@ -14,7 +14,6 @@
 
 import jax
 import jax.numpy as jnp
-
 import optimistix._misc as optx_misc
 
 
diff --git a/tests/test_root_find.py b/tests/test_root_find.py
index 432dadf..c9c9730 100644
--- a/tests/test_root_find.py
+++ b/tests/test_root_find.py
@@ -4,11 +4,10 @@
 import jax.numpy as jnp
 import jax.random as jr
 import jax.tree_util as jtu
+import optimistix as optx
 import pytest
 from equinox.internal import ω
 
-import optimistix as optx
-
 from .helpers import (
     finite_difference_jvp,
     fixed_point_fn_init_args,
diff --git a/tests/test_solve.py b/tests/test_solve.py
index 1b28a5c..39c52d9 100644
--- a/tests/test_solve.py
+++ b/tests/test_solve.py
@@ -1,5 +1,4 @@
 import jax
-
 import optimistix as optx