diff --git a/pysages/ml/utils.py b/pysages/ml/utils.py
index b3a796a5..f3633cb1 100644
--- a/pysages/ml/utils.py
+++ b/pysages/ml/utils.py
@@ -4,7 +4,6 @@
 from jax import numpy as np
 from jax import random, vmap
 from jax._src.nn import initializers
-from jax.core import as_named_shape
 from jax.numpy.linalg import norm
 from jax.tree_util import PyTreeDef, tree_flatten
 from numpy import cumsum
@@ -12,6 +11,7 @@
 
 from pysages.typing import NamedTuple
 from pysages.utils import identity, prod
+from pysages.utils.compat import canonicalize_shape
 
 # Dispatcher for the `ml` submodule
 dispatch = Dispatcher()
@@ -86,17 +86,17 @@ def uniform_scaling(
         raise ValueError(f"invalid mode for variance scaling initializer: {mode}")
 
     if bias_like:
-        trim_named_shape = idem(lambda named_shp, shp, axis: as_named_shape(shp[axis:]))
+        trim_shape = idem(lambda cshp, shp, axis: canonicalize_shape(shp[axis:]))
     else:
-        trim_named_shape = idem(lambda named_shp, shp, axis: named_shp)
+        trim_shape = idem(lambda cshp, shp, axis: cshp)
 
     def init(key, shape, dtype=dtype):
-        args_named_shape = as_named_shape(shape)
-        named_shape = trim_named_shape(args_named_shape, shape, out_axis)
+        canonical_shape = canonicalize_shape(shape)
+        shape = trim_shape(canonical_shape, shape, out_axis)
         # pylint: disable-next=W0212
-        fan_in, fan_out = initializers._compute_fans(args_named_shape, in_axis, out_axis)
+        fan_in, fan_out = initializers._compute_fans(canonical_shape, in_axis, out_axis)
         s = np.array(scale / denominator(fan_in, fan_out), dtype=dtype)
-        return random.uniform(key, named_shape, dtype, -1) * transform(s)
+        return random.uniform(key, shape, dtype, -1) * transform(s)
 
     return init
 
diff --git a/pysages/utils/compat.py b/pysages/utils/compat.py
index e4382646..48ef56a6 100644
--- a/pysages/utils/compat.py
+++ b/pysages/utils/compat.py
@@ -36,6 +36,22 @@ def prod(iterable, start=1):
         return result
 
 
+# Compatibility for jax >=0.4.31
+
+# https://github.com/google/jax/blob/main/CHANGELOG.md#jax-0431-july-29-2024
+if _jax_version_tuple < (0, 4, 31):
+    _jax_core = import_module("jax.core")
+
+    def canonicalize_shape(shape):
+        return _jax_core.as_named_shape(shape)
+
+else:
+    _jax_core = import_module("jax._src.core")
+
+    def canonicalize_shape(shape):
+        return _jax_core.canonicalize_shape(shape)
+
+
 # Compatibility for jax >=0.4.22
 
 # https://github.com/google/jax/blob/main/CHANGELOG.md#jax-0422-dec-13-2023