diff --git a/bob/bio/face/test/data/cropped.hdf5 b/bob/bio/face/test/data/cropped.hdf5
index 0a597b8160f0fdea50d8e0587cb544720ce3b33a..7ed3b698ada88cf8b1c1288466fbfc4865917f55 100644
Binary files a/bob/bio/face/test/data/cropped.hdf5 and b/bob/bio/face/test/data/cropped.hdf5 differ
diff --git a/bob/bio/face/test/test_preprocessors.py b/bob/bio/face/test/test_preprocessors.py
index 511fb3606a48ae70af62bb97ce905a92864a2526..766177f49acc0610d4384c02dda6b0586efc2aff 100644
--- a/bob/bio/face/test/test_preprocessors.py
+++ b/bob/bio/face/test/test_preprocessors.py
@@ -20,6 +20,7 @@
 
 import numpy
 import pkg_resources
+import pytest
 
 regenerate_refs = False
 
@@ -55,7 +56,7 @@ def _compare(
 
     # compare reference
     reference = read_function(reference)
-    assert numpy.allclose(data, reference, atol=atol, rtol=rtol)
+    numpy.testing.assert_allclose(data, reference, rtol=rtol, atol=atol)
     return reference
 
 
@@ -118,6 +119,7 @@ def test_face_crop():
     cropper = bob.bio.face.preprocessor.FaceCrop(
         cropped_image_size=(CROPPED_IMAGE_HEIGHT, CROPPED_IMAGE_WIDTH),
         cropped_positions={"leye": LEFT_EYE_POS, "reye": RIGHT_EYE_POS},
+        dtype=int,
     )
 
     assert isinstance(cropper, bob.bio.face.preprocessor.FaceCrop)
@@ -138,6 +140,7 @@ def test_face_crop():
             "reye": annotation["reye"],
             "leye": annotation["leye"],
         },
+        dtype=int,
     )
 
     # result must be identical to the original face cropper (same eyes are used)
@@ -226,6 +229,7 @@ def test_multi_face_crop():
     eyes_cropper = bob.bio.face.preprocessor.FaceCrop(
         cropped_image_size=(CROPPED_IMAGE_HEIGHT, CROPPED_IMAGE_WIDTH),
         cropped_positions={"leye": LEFT_EYE_POS, "reye": RIGHT_EYE_POS},
+        dtype=int,
     )
 
     face_cropper = bob.bio.face.preprocessor.FaceCrop(
@@ -233,6 +237,7 @@ def test_multi_face_crop():
         cropper=FaceCropBoundingBox(
             final_image_size=(CROPPED_IMAGE_HEIGHT, CROPPED_IMAGE_WIDTH)
         ),
+        dtype=int,
     )
 
     cropper = bob.bio.face.preprocessor.MultiFaceCrop(
@@ -258,18 +263,13 @@ def test_multi_face_crop():
     _compare(bbox_cropped.astype("uint8"), bbox_reference)
 
     # test a ValueError is raised if the annotations don't match any cropper
-    try:
+    with pytest.raises(ValueError):
         annot = dict(landmark_A=(60, 60), landmark_B=(120, 120))
         cropper.transform([image], [annot])
-        assert (
-            0
-        ), "MultiFaceCrop did not raise a ValueError for annotations matching no cropper"
-    except ValueError:
-        pass
 
     # test that the first annotator is taken when multiple exist
     annot = {**eye_annotation, **bbox_annotation}
-    eye_cropped = cropper.transform([image], [annot])
+    eye_cropped = cropper.transform([image], [annot])[0]
     _compare(eye_cropped, eye_reference)
 
 
@@ -292,7 +292,7 @@ def test_tan_triggs():
 
     # execute face cropper
     _compare(
-        preprocessor.transform([image], [annotation]),
+        preprocessor.transform([image], [annotation])[0],
         pkg_resources.resource_filename(
             "bob.bio.face.test", "data/tan_triggs_cropped.hdf5"
         ),
@@ -306,7 +306,7 @@ def test_tan_triggs():
 
     # result must be identical to the original face cropper (same eyes are used)
     _compare(
-        preprocessor.transform([image], [annotation]),
+        preprocessor.transform([image], [annotation])[0],
         pkg_resources.resource_filename(
             "bob.bio.face.test", "data/tan_triggs_none.hdf5"
         ),
@@ -333,7 +333,7 @@ def test_inorm_lbp():
 
     # execute preprocessor
     _compare(
-        preprocessor.transform([image], [annotation]),
+        preprocessor.transform([image], [annotation])[0],
         pkg_resources.resource_filename(
             "bob.bio.face.test", "data/inorm_lbp_cropped.hdf5"
         ),
@@ -366,7 +366,7 @@ def test_heq():
 
     # execute preprocessor
     _compare(
-        preprocessor.transform([image], [annotation]),
+        preprocessor.transform([image], [annotation])[0],
         pkg_resources.resource_filename(
             "bob.bio.face.test", "data/histogram_cropped.hdf5"
         ),
diff --git a/conda/meta.yaml b/conda/meta.yaml
index 8b7d32801781db9861407520d09889068a7092b1..39c2d2e0cb713b993ca8525195c5103513327762 100644
--- a/conda/meta.yaml
+++ b/conda/meta.yaml
@@ -6,7 +6,6 @@ package:
   version: {{ environ.get('BOB_PACKAGE_VERSION', '0.0.1') }}
 
 build:
-  skip: True  # [arm64]
   entry_points:
   number: {{ environ.get('BOB_BUILD_NUMBER', 0) }}
   run_exports: