diff --git a/numpyro/ops/indexing.py b/numpyro/ops/indexing.py
index 3dfc4efd8b..c69fb225c3 100644
--- a/numpyro/ops/indexing.py
+++ b/numpyro/ops/indexing.py
@@ -1,14 +1,18 @@
 # Copyright Contributors to the Pyro project.
 # SPDX-License-Identifier: Apache-2.0
 
+from typing import Any
+
+from jax import Array
 import jax.numpy as jnp
+from jax.typing import ArrayLike
 
 
 def _is_batched(arg):
     return jnp.ndim(arg) > 0
 
 
-def vindex(tensor, args):
+def vindex(tensor: ArrayLike, args: tuple[Any, ...]) -> Array:
     """
     Vectorized advanced indexing with broadcasting semantics.
 
@@ -72,10 +76,10 @@ def vindex(tensor, args):
         This implementation is similar to the proposed notation
         ``x.vindex[]`` except for slightly different handling of ``Ellipsis``.
 
-    :param jnp.ndarray tensor: A tensor to be indexed.
-    :param tuple args: An index, as args to ``__getitem__``.
+    :param ArrayLike tensor: A tensor to be indexed.
+    :param tuple[Any, ...] args: An index, as args to ``__getitem__``.
     :returns: A nonstandard interpretation of ``tensor[args]``.
-    :rtype: jnp.ndarray
+    :rtype: Array
     """
     if not isinstance(args, tuple):
         return tensor[args]
@@ -140,8 +144,8 @@ class Vindex:
     :return: An object with a special :meth:`__getitem__` method.
     """
 
-    def __init__(self, tensor):
+    def __init__(self, tensor: ArrayLike) -> None:
         self._tensor = tensor
 
-    def __getitem__(self, args):
+    def __getitem__(self, args: tuple[Any, ...]) -> Array:
         return vindex(self._tensor, args)