diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 470c04c0..deb479a4 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+    rev: v4.6.0
     hooks:
       # - id: double-quote-string-fixer  # for single quotes: uncomment and add black config “skip-string-normalization”
       - id: trailing-whitespace
@@ -11,19 +11,19 @@ repos:
       - id: docformatter
         args: ["--in-place", "--wrap-summaries=100", "--wrap-descriptions=100", "--config=./pyproject.toml"]
   - repo: https://github.com/psf/black
-    rev: 23.9.1
+    rev: 24.8.0
     hooks:
       - id: black
   - repo: https://github.com/pycqa/isort
-    rev: 5.12.0
+    rev: 5.13.2
     hooks:
       - id: isort
   - repo: https://github.com/csachs/pyproject-flake8
-    rev: v6.1.0
+    rev: v7.0.0
     hooks:
       - id: pyproject-flake8
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v3.0.3
+    rev: v4.0.0-alpha.8
     hooks:
       - id: prettier
         types_or: [css, javascript]
diff --git a/cirrocumulus/abstract_backed_dataset.py b/cirrocumulus/abstract_backed_dataset.py
index 25baadb8..a997bff7 100644
--- a/cirrocumulus/abstract_backed_dataset.py
+++ b/cirrocumulus/abstract_backed_dataset.py
@@ -3,10 +3,10 @@
 import pandas as pd
 import scipy.sparse
 from anndata import AnnData
+from anndata._core.sparse_dataset import sparse_dataset
 
 from cirrocumulus.abstract_dataset import AbstractDataset
 from cirrocumulus.anndata_util import ADATA_LAYERS_UNS_KEY, ADATA_MODULE_UNS_KEY
-from cirrocumulus.sparse_dataset import SparseDataset
 
 
 # string_dtype = h5py.check_string_dtype(dataset.dtype)
@@ -73,8 +73,8 @@ def get_X(self, var_ids, keys, node):
             get_item = var_ids.get_indexer_for(keys)
 
         if self.is_group(node):
-            sparse_dataset = SparseDataset(node)  # sparse
-            X = sparse_dataset[:, get_item]
+            ds = sparse_dataset(node)  # sparse
+            X = ds[:, get_item]
         else:  # dense
             X = self.slice_dense_array(node, get_item)
         var = pd.DataFrame(index=keys)
diff --git a/cirrocumulus/concat.py b/cirrocumulus/concat.py
index 5ef32512..d90e958c 100644
--- a/cirrocumulus/concat.py
+++ b/cirrocumulus/concat.py
@@ -148,9 +148,11 @@ def concat_spatial(paths: list[str], output_path: str, ncols: int = 2):
 
 def create_parser(description=False):
     parser = argparse.ArgumentParser(
-        description="Concatenate datasets in a grid layout. If all the datasets are spatial datasets, then tissue images are concatenated."
-        if description
-        else None
+        description=(
+            "Concatenate datasets in a grid layout. If all the datasets are spatial datasets, then tissue images are concatenated."
+            if description
+            else None
+        )
     )
     parser.add_argument(
         "dataset",
diff --git a/cirrocumulus/diff_exp.py b/cirrocumulus/diff_exp.py
index 4b4fc09f..a25da862 100644
--- a/cirrocumulus/diff_exp.py
+++ b/cirrocumulus/diff_exp.py
@@ -137,11 +137,15 @@ def __init__(
                 scores=scores,
                 pvals=pvals,
                 logfoldchanges=foldchanges,
-                frac_expressed1=frac_expressed_df.loc[group_one].values
-                if frac_expressed_df is not None
-                else None,
-                frac_expressed2=frac_expressed_df.loc[group_two].values
-                if frac_expressed_df is not None
-                else None,
+                frac_expressed1=(
+                    frac_expressed_df.loc[group_one].values
+                    if frac_expressed_df is not None
+                    else None
+                ),
+                frac_expressed2=(
+                    frac_expressed_df.loc[group_two].values
+                    if frac_expressed_df is not None
+                    else None
+                ),
             )
         self.pair2results = pair2results
diff --git a/cirrocumulus/local_db_api.py b/cirrocumulus/local_db_api.py
index 79bfaacb..2f6b0bbc 100644
--- a/cirrocumulus/local_db_api.py
+++ b/cirrocumulus/local_db_api.py
@@ -50,8 +50,10 @@ def __init__(self, paths: list[str]):
                 if url.lower().endswith(".json.gz") or url.lower().endswith(".json"):
                     import gzip
 
-                    with gzip.open(fs.open(url)) if url.lower().endswith(".json.gz") else fs.open(
-                        url
+                    with (
+                        gzip.open(fs.open(url))
+                        if url.lower().endswith(".json.gz")
+                        else fs.open(url)
                     ) as f:
                         d = json.load(f)
                         if "id" in d:
diff --git a/cirrocumulus/sparse_dataset.py b/cirrocumulus/sparse_dataset.py
deleted file mode 100644
index 88a25a77..00000000
--- a/cirrocumulus/sparse_dataset.py
+++ /dev/null
@@ -1,375 +0,0 @@
-"""This module implements on disk sparse datasets.
-
-This code is based on and uses the conventions of h5sparse_ by `Appier Inc.`_.
-See the copyright and license note in this directory source code.
-
-.. _h5sparse: https://github.com/appier/h5sparse
-.. _Appier Inc.: https://www.appier.com/
-"""
-
-import collections.abc as cabc
-from itertools import accumulate, chain
-from typing import Iterable, NamedTuple, Sequence, Tuple, Type, Union
-
-import numpy as np
-import scipy.sparse as ss
-from scipy.sparse import _sparsetools
-
-
-try:
-    # Not really important, just for IDEs to be more helpful
-    from scipy.sparse.compressed import _cs_matrix
-except ImportError:
-    _cs_matrix = ss.spmatrix
-
-from anndata._core.index import _subset
-
-
-Index1D = Union[slice, int, str, np.int64, np.ndarray]
-Index = Union[Index1D, Tuple[Index1D, Index1D], ss.spmatrix]
-
-
-def unpack_index(index: Index) -> tuple[Index1D, Index1D]:
-    if not isinstance(index, tuple):
-        return index, slice(None)
-    elif len(index) == 2:
-        return index
-    elif len(index) == 1:
-        return index[0], slice(None)
-    else:
-        raise IndexError("invalid number of indices")
-
-
-class BackedFormat(NamedTuple):
-    format_str: str
-    backed_type: Type["BackedSparseMatrix"]
-    memory_type: Type[ss.spmatrix]
-
-
-class BackedSparseMatrix(_cs_matrix):
-    """Mixin class for backed sparse matrices.
-
-    Largely needed for the case `backed_sparse_csr(...)[:]`, since that calls copy on `.data`,
-    `.indices`, and `.indptr`.
-    """
-
-    def copy(self) -> ss.spmatrix:
-        if ss.issparse(self.data):
-            return super().copy()
-        else:
-            return SparseDataset(self.group).to_memory()
-
-    def _set_many(self, i: Iterable[int], j: Iterable[int], x):
-        """Sets value at each (i, j) to x.
-
-        Here (i,j) index major and minor respectively, and must not contain duplicate entries.
-        """
-        # Scipy 1.3+ compat
-        n_samples = 1 if np.isscalar(x) else len(x)
-        offsets = self._offsets(i, j, n_samples)
-
-        if -1 not in offsets:
-            # make a list for interaction with h5py or zarr
-            offsets = list(offsets)
-            # only affects existing non-zero cells
-            self.data[offsets] = x
-            return
-
-        else:
-            raise ValueError("You cannot change the sparsity structure of a SparseDataset.")
-            # replace where possible
-            # mask = offsets > -1
-            # # offsets[mask]
-            # bool_data_mask = np.zeros(len(self.data), dtype=bool)
-            # bool_data_mask[offsets[mask]] = True
-            # self.data[bool_data_mask] = x[mask]
-            # # self.data[offsets[mask]] = x[mask]
-            # # only insertions remain
-            # mask = ~mask
-            # i = i[mask]
-            # i[i < 0] += M
-            # j = j[mask]
-            # j[j < 0] += N
-            # self._insert_many(i, j, x[mask])
-
-    def _zero_many(self, i: Sequence[int], j: Sequence[int]):
-        """Sets value at each (i, j) to zero, preserving sparsity structure.
-
-        Here (i,j) index major and minor respectively.
-        """
-        offsets = self._offsets(i, j, len(i))
-
-        # only assign zeros to the existing sparsity structure
-        self.data[list(offsets[offsets > -1])] = 0
-
-    def _offsets(self, i: Iterable[int], j: Iterable[int], n_samples: int) -> np.ndarray:
-        i, j, M, N = self._prepare_indices(i, j)
-        offsets = np.empty(n_samples, dtype=self.indices.dtype)
-        ret = _sparsetools.csr_sample_offsets(
-            M, N, self.indptr, self.indices, n_samples, i, j, offsets
-        )
-        if ret == 1:
-            # rinse and repeat
-            self.sum_duplicates()
-            _sparsetools.csr_sample_offsets(
-                M, N, self.indptr, self.indices, n_samples, i, j, offsets
-            )
-        return offsets
-
-
-class backed_csr_matrix(BackedSparseMatrix, ss.csr_matrix):
-    def _get_intXslice(self, row: int, col: slice) -> ss.csr_matrix:
-        return ss.csr_matrix(get_compressed_vector(self, row), shape=(1, self.shape[1]))[:, col]
-
-    def _get_sliceXslice(self, row: slice, col: slice) -> ss.csr_matrix:
-        out_shape = (
-            slice_len(row, self.shape[0]),
-            slice_len(col, self.shape[1]),
-        )
-        if out_shape[0] == 1:
-            return self._get_intXslice(slice_as_int(row, self.shape[0]), col)
-        elif out_shape[1] == self.shape[1] and out_shape[0] < self.shape[0]:
-            return self._get_arrayXslice(np.arange(*row.indices(self.shape[0])), col)
-        return super()._get_sliceXslice(row, col)
-
-    def _get_arrayXslice(self, row: Sequence[int], col: slice) -> ss.csr_matrix:
-        idxs = np.asarray(row)
-        if idxs.dtype == bool:
-            idxs = np.where(idxs)
-        return ss.csr_matrix(get_compressed_vectors(self, idxs), shape=(len(idxs), self.shape[1]))[
-            :, col
-        ]
-
-
-class backed_csc_matrix(BackedSparseMatrix, ss.csc_matrix):
-    def _get_sliceXint(self, row: slice, col: int) -> ss.csc_matrix:
-        return ss.csc_matrix(get_compressed_vector(self, col), shape=(self.shape[0], 1))[row, :]
-
-    def _get_sliceXslice(self, row: slice, col: slice) -> ss.csc_matrix:
-        out_shape = (
-            slice_len(row, self.shape[0]),
-            slice_len(col, self.shape[1]),
-        )
-        if out_shape[1] == 1:
-            return self._get_sliceXint(row, slice_as_int(col, self.shape[1]))
-        elif out_shape[0] == self.shape[0] and out_shape[1] < self.shape[1]:
-            if col.step is not None:
-                return self._get_sliceXarray(row, np.arange(*col.indices(self.shape[1])))
-            start = col.start
-            stop = col.stop
-            if stop is not None and stop > 0:
-                stop += 1
-            if start is not None and start < 0:
-                start -= 1
-            indptr_slice = slice(start, stop)
-            indptr = self.group["indptr"][indptr_slice]
-            data = self.group["data"][indptr[0] : indptr[-1]]
-            indices = self.group["indices"][indptr[0] : indptr[-1]]
-            indptr -= indptr[0]
-            shape = (self.shape[0], indptr.size - 1)
-            return ss.csc_matrix((data, indices, indptr), shape=shape)  # much faster
-            # return self._get_sliceXarray(row, np.arange(*col.indices(self.shape[1])))
-        return super()._get_sliceXslice(row, col)
-
-    def _get_sliceXarray(self, row: slice, col: Sequence[int]) -> ss.csc_matrix:
-        idxs = np.asarray(col)
-        if idxs.dtype == bool:
-            idxs = np.where(idxs)
-        return ss.csc_matrix(get_compressed_vectors(self, idxs), shape=(self.shape[0], len(idxs)))[
-            row, :
-        ]
-
-
-FORMATS = [
-    BackedFormat("csr", backed_csr_matrix, ss.csr_matrix),
-    BackedFormat("csc", backed_csc_matrix, ss.csc_matrix),
-]
-
-
-def slice_len(s: slice, dim: int) -> int:
-    """Returns length of `a[s]` where `len(a) == dim`."""
-    return len(range(*s.indices(dim)))
-
-
-def slice_as_int(s: slice, dim: int) -> int:
-    """Converts slices of length 1 to the integer index they’ll access."""
-    out = list(range(*s.indices(dim)))
-    assert len(out) == 1
-    return out[0]
-
-
-def get_compressed_vectors(
-    x: BackedSparseMatrix, row_idxs: Iterable[int]
-) -> Tuple[Sequence, Sequence, Sequence]:
-    slices = [slice(*(x.indptr[i : i + 2])) for i in row_idxs]
-    data = np.concatenate([x.data[s] for s in slices])
-    indices = np.concatenate([x.indices[s] for s in slices])
-    indptr = list(accumulate(chain((0,), (s.stop - s.start for s in slices))))
-    return data, indices, indptr
-
-
-def get_compressed_vector(x: BackedSparseMatrix, idx: int) -> Tuple[Sequence, Sequence, Sequence]:
-    s = slice(*(x.indptr[idx : idx + 2]))
-    data = x.data[s]
-    indices = x.indices[s]
-    indptr = [0, len(data)]
-    return data, indices, indptr
-
-
-def get_format_str(data: ss.spmatrix) -> str:
-    for fmt, _, memory_class in FORMATS:
-        if isinstance(data, memory_class):
-            return fmt
-    raise ValueError(f"Data type {type(data)} is not supported.")
-
-
-def get_memory_class(format_str: str) -> Type[ss.spmatrix]:
-    for fmt, _, memory_class in FORMATS:
-        if format_str == fmt:
-            return memory_class
-    raise ValueError(f"Format string {format_str} is not supported.")
-
-
-def get_backed_class(format_str: str) -> Type[BackedSparseMatrix]:
-    for fmt, backed_class, _ in FORMATS:
-        if format_str == fmt:
-            return backed_class
-    raise ValueError(f"Format string {format_str} is not supported.")
-
-
-class SparseDataset:
-    """Analogous to :class:`h5py.Dataset or zarr.Group`, but for sparse matrices."""
-
-    def __init__(self, group):
-        self.group = group
-        self.indptr = None
-
-    @property
-    def dtype(self) -> np.dtype:
-        return self.group["data"].dtype
-
-    @property
-    def format_str(self) -> str:
-        if "h5sparse_format" in self.group.attrs:
-            return self.group.attrs["h5sparse_format"]
-        else:
-            # Should this be an extra field?
-            return self.group.attrs["encoding-type"].replace("_matrix", "")
-
-    @property
-    def name(self) -> str:
-        return self.group.name
-
-    @property
-    def shape(self) -> Tuple[int, int]:
-        shape = self.group.attrs.get("h5sparse_shape")
-        return tuple(self.group.attrs["shape"] if shape is None else shape)
-
-    @property
-    def value(self) -> ss.spmatrix:
-        return self.to_memory()
-
-    def __repr__(self) -> str:
-        return (
-            f"<sparse dataset: format {self.format_str!r}, "
-            f"shape {self.shape}, "
-            f'type {self.group["data"].dtype.str!r}>'
-        )
-
-    def __getitem__(self, index: Union[Index, Tuple[()]]) -> Union[float, ss.spmatrix]:
-        row, col = self._normalize_index(index)
-        mtx = self.to_backed()
-        return mtx[row, col]
-
-    def __setitem__(self, index: Union[Index, Tuple[()]], value):
-        row, col = self._normalize_index(index)
-        mock_matrix = self.to_backed()
-        mock_matrix[row, col] = value
-
-    def _normalize_index(self, index: Union[Index, Tuple[()]]) -> Tuple[np.ndarray, np.ndarray]:
-        if isinstance(index, tuple) and len(index) == 0:
-            index = slice(None)
-        row, col = unpack_index(index)
-        if all(isinstance(x, cabc.Iterable) for x in (row, col)):
-            row, col = np.ix_(row, col)
-        return row, col
-
-    def append(self, sparse_matrix: ss.spmatrix):
-        # Prep variables
-        shape = self.shape
-        if isinstance(sparse_matrix, SparseDataset):
-            sparse_matrix = sparse_matrix.to_backed()
-
-        # Check input
-        if not ss.isspmatrix(sparse_matrix):
-            raise NotImplementedError(
-                "Currently, only sparse matrices of equivalent format can be "
-                "appended to a SparseDataset."
-            )
-        if self.format_str not in {"csr", "csc"}:
-            raise NotImplementedError(
-                f"The append method for format {self.format_str} " f"is not implemented."
-            )
-        if self.format_str != get_format_str(sparse_matrix):
-            raise ValueError(
-                f"Matrices must have same format. Currently are "
-                f"{self.format_str!r} and {get_format_str(sparse_matrix)!r}"
-            )
-
-        # shape
-        if self.format_str == "csr":
-            assert (
-                shape[1] == sparse_matrix.shape[1]
-            ), "CSR matrices must have same size of dimension 1 to be appended."
-            new_shape = (shape[0] + sparse_matrix.shape[0], shape[1])
-        elif self.format_str == "csc":
-            assert (
-                shape[0] == sparse_matrix.shape[0]
-            ), "CSC matrices must have same size of dimension 0 to be appended."
-            new_shape = (shape[0], shape[1] + sparse_matrix.shape[1])
-        else:
-            assert False, "We forgot to update this branching to a new format"
-        if "h5sparse_shape" in self.group.attrs:
-            del self.group.attrs["h5sparse_shape"]
-        self.group.attrs["shape"] = new_shape
-
-        # data
-        data = self.group["data"]
-        orig_data_size = data.shape[0]
-        data.resize((orig_data_size + sparse_matrix.data.shape[0],))
-        data[orig_data_size:] = sparse_matrix.data
-
-        # indptr
-        indptr = self.group["indptr"]
-        orig_data_size = indptr.shape[0]
-        append_offset = indptr[-1]
-        indptr.resize((orig_data_size + sparse_matrix.indptr.shape[0] - 1,))
-        indptr[orig_data_size:] = sparse_matrix.indptr[1:].astype(np.int64) + append_offset
-
-        # indices
-        indices = self.group["indices"]
-        orig_data_size = indices.shape[0]
-        indices.resize((orig_data_size + sparse_matrix.indices.shape[0],))
-        indices[orig_data_size:] = sparse_matrix.indices
-
-    def to_backed(self) -> BackedSparseMatrix:
-        format_class = get_backed_class(self.format_str)
-        mtx = format_class(self.shape, dtype=self.dtype)
-        mtx.group = self.group
-        mtx.data = self.group["data"]
-        mtx.indices = self.group["indices"]
-        mtx.indptr = self.group["indptr"]
-        return mtx
-
-    def to_memory(self) -> ss.spmatrix:
-        format_class = get_memory_class(self.format_str)
-        mtx = format_class(self.shape, dtype=self.dtype)
-        mtx.data = self.group["data"][...]
-        mtx.indices = self.group["indices"][...]
-        mtx.indptr = self.group["indptr"][...]
-        return mtx
-
-
-@_subset.register(SparseDataset)
-def subset_sparsedataset(d, subset_idx):
-    return d[subset_idx]
diff --git a/docs/release_notes.rst b/docs/release_notes.rst
index 19f7e528..336d6477 100644
--- a/docs/release_notes.rst
+++ b/docs/release_notes.rst
@@ -1,6 +1,10 @@
 Release Notes
 -------------
 
+- 1.1.58 `September 17, 2024`
+    * Sort categories using natural sort order
+    * Compatibility with anndata 0.10.9
+
 - 1.1.57 `September 29, 2023`
     * Ensure group order is persisted when performing differential expression between two groups
     * Fixed drop-down arrow click for gene sets
diff --git a/src/AutocompleteVirtualized.js b/src/AutocompleteVirtualized.js
index b64b5075..bb8e0dff 100644
--- a/src/AutocompleteVirtualized.js
+++ b/src/AutocompleteVirtualized.js
@@ -262,8 +262,8 @@ export default function AutocompleteVirtualized(props) {
           result.text != null
             ? result.text
             : result.id != null
-            ? result.id
-            : result;
+              ? result.id
+              : result;
         textToOption.delete(text.toLowerCase());
       });
       tokens.forEach((token) => {
diff --git a/src/actions/index.js b/src/actions/index.js
index 70b3b76e..59bf4ef2 100644
--- a/src/actions/index.js
+++ b/src/actions/index.js
@@ -2425,8 +2425,8 @@ function getNewEmbeddingData(state, features) {
       embedding.spatial != null
         ? embedding.spatial.type
         : embedding.type
-        ? embedding.type
-        : TRACE_TYPE_SCATTER;
+          ? embedding.type
+          : TRACE_TYPE_SCATTER;
     let coordinates =
       traceType !== TRACE_TYPE_META_IMAGE ? cachedData[embeddingKey] : null;
     if (coordinates == null && embedding.mode != null) {
diff --git a/src/util.js b/src/util.js
index 04e20d8c..029b5b0a 100644
--- a/src/util.js
+++ b/src/util.js
@@ -680,10 +680,10 @@ export function rankdata(values) {
     return a.value < b.value
       ? -1
       : a.value === b.value
-      ? a.position < b.position
-        ? -1
-        : 1
-      : 1;
+        ? a.position < b.position
+          ? -1
+          : 1
+        : 1;
   });
 
   // Walk the sorted array, filling output array using sorted positions,
@@ -722,20 +722,20 @@ function indexSortPairs(ranks, ascending) {
       return a.value < b.value
         ? -1
         : a.value === b.value
-        ? a.position < b.position
-          ? -1
-          : 1
-        : 1;
+          ? a.position < b.position
+            ? -1
+            : 1
+          : 1;
     });
   } else {
     ranks.sort(function (a, b) {
       return a.value < b.value
         ? 1
         : a.value === b.value
-        ? a.position < b.position
-          ? 1
-          : -1
-        : -1;
+          ? a.position < b.position
+            ? 1
+            : -1
+          : -1;
     });
   }
 
diff --git a/tests/test_sparse.py b/tests/test_sparse.py
index 899893e7..ac3288a3 100644
--- a/tests/test_sparse.py
+++ b/tests/test_sparse.py
@@ -3,6 +3,7 @@
 import numpy as np
 import pytest
 import anndata as ad
+from anndata._core.sparse_dataset import sparse_dataset
 from anndata.tests.helpers import (
     array_bool_subset,
     array_int_subset,
@@ -12,8 +13,6 @@
 )
 from scipy import sparse
 
-from cirrocumulus.sparse_dataset import SparseDataset
-
 
 subset_func2 = subset_func
 
@@ -49,8 +48,8 @@ def ondisk_equivalent_adata_zarr(tmp_path):
     csr_mem.write_zarr(csr_path)
     csc_mem.write_zarr(csc_path)
 
-    csr_disk = SparseDataset(zarr.open(csr_path / "X"))
-    csc_disk = SparseDataset(zarr.open(csc_path / "X"))
+    csr_disk = sparse_dataset(zarr.open(csr_path / "X"))
+    csc_disk = sparse_dataset(zarr.open(csc_path / "X"))
 
     return csr_mem, csr_disk, csc_disk
 
@@ -122,7 +121,7 @@ def test_dataset_append_memory(tmp_path, sparse_format, append_method):
 
     with h5py.File(h5_path, "a") as f:
         ad._io.specs.write_elem(f, "mtx", a)
-        diskmtx = SparseDataset(f["mtx"])
+        diskmtx = sparse_dataset(f["mtx"])
 
         diskmtx.append(b)
         fromdisk = diskmtx.to_memory()
@@ -147,8 +146,8 @@ def test_dataset_append_disk(tmp_path, sparse_format, append_method):
     with h5py.File(h5_path, "a") as f:
         ad._io.specs.write_elem(f, "a", a)
         ad._io.specs.write_elem(f, "b", b)
-        a_disk = SparseDataset(f["a"])
-        b_disk = SparseDataset(f["b"])
+        a_disk = sparse_dataset(f["a"])
+        b_disk = sparse_dataset(f["b"])
 
         a_disk.append(b_disk)
         fromdisk = a_disk.to_memory()
@@ -173,8 +172,8 @@ def test_wrong_shape(tmp_path, sparse_format, a_shape, b_shape):
     with h5py.File(h5_path, "a") as f:
         ad._io.specs.write_elem(f, "a", a_mem)
         ad._io.specs.write_elem(f, "b", b_mem)
-        a_disk = SparseDataset(f["a"])
-        b_disk = SparseDataset(f["b"])
+        a_disk = sparse_dataset(f["a"])
+        b_disk = sparse_dataset(f["b"])
 
         with pytest.raises(AssertionError):
             a_disk.append(b_disk)
@@ -186,7 +185,7 @@ def test_wrong_formats(tmp_path):
 
     with h5py.File(h5_path, "a") as f:
         ad._io.specs.write_elem(f, "base", base)
-        disk_mtx = SparseDataset(f["base"])
+        disk_mtx = sparse_dataset(f["base"])
         pre_checks = disk_mtx.to_memory()
 
         with pytest.raises(ValueError):