diff --git a/virtualizarr/tests/test_writers/test_icechunk.py b/virtualizarr/tests/test_writers/test_icechunk.py
index e9adc1ef..eede9ac2 100644
--- a/virtualizarr/tests/test_writers/test_icechunk.py
+++ b/virtualizarr/tests/test_writers/test_icechunk.py
@@ -8,7 +8,7 @@
 
 import numpy as np
 import numpy.testing as npt
-from xarray import Dataset, concat, open_dataset, open_zarr
+from xarray import Coordinates, Dataset, concat, open_dataset, open_zarr
 from xarray.core.variable import Variable
 from zarr import Array, Group, group  # type: ignore
 from zarr.core.metadata import ArrayV3Metadata  # type: ignore
@@ -374,7 +374,7 @@ def gen_virtual_variable(
     dims: list[str] = [],
     zarr_format: Literal[2, 3] = 2,
     attrs: dict[str, Any] = {},
-) -> tuple[Variable, Dataset]:
+) -> Variable:
     manifest = generate_chunk_manifest(
         file_uri,
         shape=shape,
@@ -414,7 +414,7 @@ def gen_virtual_dataset(
     length: int = 48,
     dims: Optional[list[str]] = None,
     zarr_format: Literal[2, 3] = 2,
-    coords: Optional[dict[str, Variable]] = None,
+    coords: Optional[Coordinates] = None,
 ) -> Dataset:
     ds = open_dataset(file_uri)
     ds_dims: list[str] = cast(list[str], list(ds.dims))
diff --git a/virtualizarr/writers/icechunk.py b/virtualizarr/writers/icechunk.py
index a097bbb1..4258cb16 100644
--- a/virtualizarr/writers/icechunk.py
+++ b/virtualizarr/writers/icechunk.py
@@ -183,7 +183,7 @@ def write_virtual_variable_to_icechunk(
         append_axis = get_axis(dims, append_dim)
 
         # check if arrays can be concatenated
-        check_compatible_arrays(ma, group[name], append_axis)
+        check_compatible_arrays(ma, group[name], append_axis)  # type: ignore[arg-type]
         check_compatible_encodings(var.encoding, group[name].attrs)
 
         # determine number of existing chunks along the append axis
@@ -194,7 +194,7 @@ def write_virtual_variable_to_icechunk(
 
         # resize the array
         resize_array(
-            group[name],
+            group[name],  # type: ignore[arg-type]
             manifest_array=ma,
             append_axis=append_axis,
         )