diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 763959254..27ccc6d83 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -31,7 +31,7 @@ repos:
   - id: ruff
 
 - repo: https://github.com/pre-commit/mirrors-mypy
-  rev: '102bbee94061ff02fd361ec29c27b7cb26582f5f'  # frozen: v1.12.2
+  rev: 'bbc3dc1f890007061f18f17e2334f216ea9e5df7'  # frozen: v1.14.1
   hooks:
   - id: mypy
     files: (jax/|tests/typing_test\.py)
diff --git a/jax/_src/checkify.py b/jax/_src/checkify.py
index a77a6456c..831c4488f 100644
--- a/jax/_src/checkify.py
+++ b/jax/_src/checkify.py
@@ -260,7 +260,7 @@ class Error:
       cur_effect = None
       for error_effect, code in self._code.items():
         if self._pred[error_effect][idx]:   # type: ignore
-          if min_code is None or code[idx] < min_code:
+          if min_code is None or code[idx] < min_code:  # type: ignore
             min_code = code[idx]   # type: ignore
             cur_effect = error_effect
 
diff --git a/jax/_src/debugging.py b/jax/_src/debugging.py
index 7685ac2bf..13fe70c54 100644
--- a/jax/_src/debugging.py
+++ b/jax/_src/debugging.py
@@ -597,8 +597,12 @@ def visualize_sharding(shape: Sequence[int], sharding: Sharding, *,
       else:
         color = None
         text_color = None
-      padding = (top_padding, right_padding, bottom_padding, left_padding)
-      padding = tuple(max(x, 0) for x in padding)  # type: ignore
+      padding = (
+          max(top_padding, 0),
+          max(right_padding, 0),
+          max(bottom_padding, 0),
+          max(left_padding, 0),
+      )
       col.append(
           rich.padding.Padding(
             rich.align.Align(entry, "center", vertical="middle"), padding,
diff --git a/jax/_src/image/scale.py b/jax/_src/image/scale.py
index aa9910555..faaee6a54 100644
--- a/jax/_src/image/scale.py
+++ b/jax/_src/image/scale.py
@@ -17,6 +17,7 @@ from __future__ import annotations
 from collections.abc import Callable, Sequence
 from functools import partial
 import enum
+from typing import Any
 
 import numpy as np
 
@@ -263,7 +264,7 @@ def _resize_nearest(x, output_shape: core.Shape):
     # TODO(b/206898375): this computation produces the wrong result on
     # CPU and GPU when using float64. Use float32 until the bug is fixed.
     offsets = jnp.floor(offsets.astype(np.float32)).astype(np.int32)
-    indices = [slice(None)] * len(input_shape)
+    indices: list[Any] = [slice(None)] * len(input_shape)
     indices[d] = offsets
     x = x[tuple(indices)]
   return x
diff --git a/jax/_src/interpreters/pxla.py b/jax/_src/interpreters/pxla.py
index e4b528136..e408e4c0e 100644
--- a/jax/_src/interpreters/pxla.py
+++ b/jax/_src/interpreters/pxla.py
@@ -2003,7 +2003,9 @@ def jaxpr_transfer_mem_kinds(
   return out
 
 
-def are_all_shardings_default_mem_kind(da_object: xc.DeviceList, shardings):
+def are_all_shardings_default_mem_kind(
+    da_object: xc.DeviceList | None, shardings
+):
   if da_object is None:
     return True
   try:
@@ -2339,8 +2341,8 @@ def lower_sharding_computation(
    nreps, tuple_args, shape_poly_state) = _cached_lowering_to_hlo(
        closed_jaxpr, api_name, fun_name, backend, semantic_in_shardings,
        semantic_out_shardings, in_layouts, out_layouts, num_devices,
-       tuple(da_object) if prim_requires_devices else None, donated_invars,
-       name_stack, all_default_mem_kind, inout_aliases,
+       tuple(da_object) if prim_requires_devices else None,  # type: ignore[arg-type]
+       donated_invars, name_stack, all_default_mem_kind, inout_aliases,
        propagated_out_mem_kinds, platforms,
        lowering_parameters=lowering_parameters,
        abstract_mesh=abstract_mesh)
diff --git a/jax/_src/numpy/polynomial.py b/jax/_src/numpy/polynomial.py
index 49c119954..81d320cb7 100644
--- a/jax/_src/numpy/polynomial.py
+++ b/jax/_src/numpy/polynomial.py
@@ -437,7 +437,7 @@ def polyval(p: ArrayLike, x: ArrayLike, *, unroll: int = 16) -> Array:
   del p, x
   shape = lax.broadcast_shapes(p_arr.shape[1:], x_arr.shape)
   y = lax.full_like(x_arr, 0, shape=shape, dtype=x_arr.dtype)
-  y, _ = lax.scan(lambda y, p: (y * x_arr + p, None), y, p_arr, unroll=unroll)
+  y, _ = lax.scan(lambda y, p: (y * x_arr + p, None), y, p_arr, unroll=unroll)  # type: ignore[misc]
   return y
 
 
diff --git a/jax/_src/numpy/ufunc_api.py b/jax/_src/numpy/ufunc_api.py
index 5dbd67e62..9d1f0840c 100644
--- a/jax/_src/numpy/ufunc_api.py
+++ b/jax/_src/numpy/ufunc_api.py
@@ -461,7 +461,7 @@ class ufunc:
       idx = tuple(ind if isinstance(ind, slice) else ind[i] for ind in indices)
       a = a.at[idx].set(self(a.at[idx].get(), *(arg[i] for arg in args)))
       return (i + 1, a), x
-    carry, _ = jax.lax.scan(scan_fun, (0, a), None, len(indices[0]))
+    carry, _ = jax.lax.scan(scan_fun, (0, a), None, len(indices[0]))  # type: ignore[arg-type]
     return carry[1]
 
   @partial(jax.jit, static_argnames=['self', 'axis', 'dtype'])
diff --git a/jax/_src/numpy/util.py b/jax/_src/numpy/util.py
index b5a1a3bb6..e902950e7 100644
--- a/jax/_src/numpy/util.py
+++ b/jax/_src/numpy/util.py
@@ -94,7 +94,7 @@ def promote_dtypes_inexact(*args: ArrayLike) -> list[Array]:
   Promotes arguments to an inexact type."""
   to_dtype, weak_type = dtypes._lattice_result_type(*args)
   to_dtype = dtypes.canonicalize_dtype(to_dtype, allow_extended_dtype=True)  # type: ignore[assignment]
-  to_dtype_inexact = dtypes.to_inexact_dtype(to_dtype)
+  to_dtype_inexact = dtypes.to_inexact_dtype(to_dtype)  # type: ignore[arg-type]
   return [lax._convert_element_type(x, to_dtype_inexact, weak_type)
           for x in args]
 
diff --git a/jax/_src/pallas/mosaic_gpu/primitives.py b/jax/_src/pallas/mosaic_gpu/primitives.py
index 4fd63fb9f..01adc42ea 100644
--- a/jax/_src/pallas/mosaic_gpu/primitives.py
+++ b/jax/_src/pallas/mosaic_gpu/primitives.py
@@ -494,7 +494,7 @@ def _wgmma_lowering(
     b_transforms_tree,
 ):
   _, a_aval, *_ = ctx.avals_in
-  lhs_swizzle = None
+  lhs_swizzle: int | None = None
   if a_transforms_tree is not None:
     a_transforms_leaves, b_transforms_leaves = util.split_list(
         transforms_leaves, [a_transforms_tree.num_leaves]
diff --git a/jax/_src/pallas/pallas_call.py b/jax/_src/pallas/pallas_call.py
index 583754cde..7e0bf5830 100644
--- a/jax/_src/pallas/pallas_call.py
+++ b/jax/_src/pallas/pallas_call.py
@@ -729,7 +729,7 @@ def _pallas_call_batching_rule(
     for pos, invar in enumerate(jaxpr.invars):
       ragged_axis_values[pos] = var_to_raggedness[invar]
 
-    per_input_ragged_axis_dim = []
+    per_input_ragged_axis_dim: list[int | None] = []
     for rav in ragged_axis_values:
       if rav is not None:
         per_input_ragged_axis_dim.append(rav[1])
diff --git a/jax/_src/state/indexing.py b/jax/_src/state/indexing.py
index 2da93e3d8..7abaa3185 100644
--- a/jax/_src/state/indexing.py
+++ b/jax/_src/state/indexing.py
@@ -17,7 +17,7 @@
 from __future__ import annotations
 
 import dataclasses
-from typing import Any, Union
+from typing import Any, Sequence, Union
 
 from jax._src import core
 from jax._src import tree_util
@@ -198,20 +198,20 @@ class NDIndexer:
       # TODO(slebedev): Consider requiring `indices` to be a Sequence.
       indices = (indices,)
 
-    indices = list(indices)
     if num_ellipsis := sum(idx is ... for idx in indices):
       if num_ellipsis > 1:
         raise ValueError("Only one ellipsis is supported.")
       # Expand ... so that `indices` has the same length as `shape`.
       ip = indices.index(...)
+      indices = list(indices)
       indices[ip:ip+1] = [slice(None)] * (len(shape) - len(indices) + 1)
-    if len(indices) > len(shape):
       indices = tuple(indices)
+    if len(indices) > len(shape):
       raise ValueError("`indices` must not be longer than `shape`: "
                        f"{indices=}, {shape=}")
     elif len(indices) < len(shape):
       # Pad `indices` to have the same length as `shape`.
-      indices.extend([slice(None)] * (len(shape) - len(indices)))
+      indices = (*indices, *[slice(None)] * (len(shape) - len(indices)))
 
     # Promote all builtin `slice`s to `Slice`.
     indices = tuple(
@@ -220,6 +220,7 @@ class NDIndexer:
 
     is_int_indexing = [not isinstance(i, Slice) for i in indices]
     if any(is_int_indexing):
+      int_indexers: Sequence[Any]
       other_indexers, int_indexers = partition_list(is_int_indexing, indices)
       indexer_shapes = tuple(core.get_aval(i).shape for i in int_indexers)
       try:
diff --git a/jax/experimental/rnn.py b/jax/experimental/rnn.py
index 1629e7204..55cf2b3ba 100644
--- a/jax/experimental/rnn.py
+++ b/jax/experimental/rnn.py
@@ -84,7 +84,7 @@ TODO:
 """
 from functools import partial
 import math
-from typing import cast, Any
+from typing import Any
 
 import jax
 import numpy as np
@@ -256,15 +256,15 @@ def _lstm_cudnn_allow_tf32(precision: lax.PrecisionLike) -> bool:
   if precision is None or not (isinstance(precision, tuple) and len(precision) == 2):
     return True
   # cuDNN allows only one precision specifier per RNN op
-  precision, _ = cast(tuple[lax.Precision, lax.Precision], precision)
-  if precision == lax.Precision.HIGHEST:
-    return False
-  elif precision == lax.Precision.HIGH:
-    return True
-  elif precision == lax.Precision.DEFAULT: # bfloat16
-    raise NotImplementedError("bfloat16 support not implemented for LSTM")
-  else:
-    raise ValueError(f"Unexpected precision specifier value {precision}")
+  match precision:
+    case (lax.Precision.HIGHEST, _):
+      return False
+    case (lax.Precision.HIGH, _):
+      return True
+    case (lax.Precision.DEFAULT, _): # bfloat16
+      raise NotImplementedError("bfloat16 support not implemented for LSTM")
+    case _:
+      raise ValueError(f"Unexpected precision specifier value {precision}")
 
 
 @partial(custom_vjp, nondiff_argnums=(5, 6, 7, 8, 9, 10))
diff --git a/jaxlib/cpu/_lapack/eig.pyi b/jaxlib/cpu/_lapack/eig.pyi
index 338c15402..75fea332b 100644
--- a/jaxlib/cpu/_lapack/eig.pyi
+++ b/jaxlib/cpu/_lapack/eig.pyi
@@ -13,9 +13,7 @@
 # limitations under the License.
 
 import enum
-from typing import ClassVar
-
 
 class ComputationMode(enum.Enum):
-  kComputeEigenvectors: ClassVar[ComputationMode] = ...
-  kNoEigenvectors: ClassVar[ComputationMode] = ...
+  kComputeEigenvectors = ...
+  kNoEigenvectors = ...
diff --git a/jaxlib/cpu/_lapack/schur.pyi b/jaxlib/cpu/_lapack/schur.pyi
index add01b049..5153ad864 100644
--- a/jaxlib/cpu/_lapack/schur.pyi
+++ b/jaxlib/cpu/_lapack/schur.pyi
@@ -13,14 +13,13 @@
 # limitations under the License.
 
 import enum
-from typing import ClassVar
 
 
 class ComputationMode(enum.Enum):
-  kComputeSchurVectors: ClassVar[ComputationMode]
-  kNoComputeSchurVectors: ClassVar[ComputationMode]
+  kComputeSchurVectors = ...
+  kNoComputeSchurVectors = ...
 
 
 class Sort(enum.Enum):
-  kNoSortEigenvalues: ClassVar[Sort]
-  kSortEigenvalues: ClassVar[Sort]
+  kNoSortEigenvalues = ...
+  kSortEigenvalues = ...
diff --git a/pyproject.toml b/pyproject.toml
index c804fed2a..e32b14a89 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,6 +7,7 @@ show_error_codes = true
 disable_error_code = "attr-defined, name-defined, annotation-unchecked"
 no_implicit_optional = true
 warn_redundant_casts = true
+allow_redefinition = true
 
 [[tool.mypy.overrides]]
 module = [