diff --git a/machine_common_sense/serializer.py b/machine_common_sense/serializer.py
index 569f46b5e..35f08acce 100644
--- a/machine_common_sense/serializer.py
+++ b/machine_common_sense/serializer.py
@@ -98,7 +98,7 @@ def _ext_pack(x):
                 msgpack.packb([
                     x.uuid, x.color, x.dimensions, x.direction, x.distance,
                     x.distance_in_steps, x.distance_in_world, x.held, x.mass,
-                    x.material_list, x.position, x.rotation, x.shape, x.state_list, x.texture_color_list, x.visible
+                    x.material_list, x.position, x.rotation, x.visible
                 ],
                     default=SerializerMsgPack._ext_pack,
                     strict_types=True))
@@ -158,11 +158,11 @@ def _ext_unpack(code, data):
         elif code == 5:
             uuid, color, dimensions, direction, distance, distance_in_steps, \
                 distance_in_world, held, mass, material_list, position, \
-                rotation, shape, state_list, texture_color_list, visible = msgpack.unpackb(
+                rotation, visible = msgpack.unpackb(
                     data, ext_hook=SerializerMsgPack._ext_unpack)
             return ObjectMetadata(uuid, color, dimensions, direction, distance,
                                   distance_in_steps, distance_in_world, held,
-                                  mass, material_list, position, rotation, shape, state_list, texture_color_list,
+                                  mass, material_list, position, rotation,
                                   visible)
         elif code == 6:
             x = msgpack.unpackb(data, ext_hook=SerializerMsgPack._ext_unpack)
@@ -260,9 +260,6 @@ def default(self, x):
                     'material_list': x.material_list,
                     'position': x.position,
                     'rotation': x.rotation,
-                    'shape': x.shape,
-                    'state_list': x.state_list,
-                    'texture_color_list': x.texture_color_list,
                     'visible': x.visible
                 }
             elif isinstance(x, np.ndarray):
@@ -282,8 +279,8 @@ def convert_object_list(raw_list):
                 object_raw['distance'], object_raw['distance_in_steps'],
                 object_raw['distance_in_world'], object_raw['held'],
                 object_raw['mass'], object_raw['material_list'],
-                object_raw['position'], object_raw['rotation'], object_raw['shape'], object_raw['state_list'],
-                object_raw['texture_color_list'], object_raw['visible'])
+                object_raw['position'], object_raw['rotation'],
+                object_raw['visible'])
             object_list.append(obj)
         return object_list
 
diff --git a/requirements.txt b/requirements.txt
index 7ce7211bc..9527e72f3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,6 @@ Jinja2==2.11.3
 MarkupSafe==1.1.1
 matplotlib==3.3.2
 msgpack==1.0.0
-numpy==1.19.4
 opencv-python==4.4.0.44
 packaging==20.4
 pre-commit==2.7.1
diff --git a/tests/test.msgpack b/tests/test.msgpack
index f1ee1653f..6dc5a1956 100644
Binary files a/tests/test.msgpack and b/tests/test.msgpack differ
diff --git a/tests/test_serializer.py b/tests/test_serializer.py
index 17e326859..1a8473578 100644
--- a/tests/test_serializer.py
+++ b/tests/test_serializer.py
@@ -1,4 +1,3 @@
-import json
 import unittest
 
 import numpy as np
@@ -18,9 +17,8 @@ def _helper_get_step_metadata():
 
     def test_serialization_msgpack(self):
         unpacked_metadata = TestSerializer._helper_get_step_metadata()
-        assert abs(unpacked_metadata.reward - (-0.036000000000000004)) < 1e-04, 'Reward unexpected.'
-        assert abs(unpacked_metadata.rotation - 0.0) < 1e-04, 'Rotation unexpected.'
-        assert type(unpacked_metadata.object_list[-1].shape) == str, 'Shape type unexpected.'
+        assert unpacked_metadata.reward == 0.0, 'Reward unexpected.'
+        assert unpacked_metadata.rotation == 0.0, 'Rotation unexpected.'
 
     def test_serialization_json(self):
         unpacked_metadata = TestSerializer._helper_get_step_metadata()
@@ -28,14 +26,12 @@ def test_serialization_json(self):
         serializer = mcs.SerializerJson()
         json_dump = serializer.serialize(unpacked_metadata)
         unpacked_metadata = serializer.deserialize(json_dump)
-
         self.assertEqual(len(unpacked_metadata.depth_map_list), 1)
         self.assertIsInstance(unpacked_metadata.depth_map_list[0], np.ndarray)
         self.assertEqual(unpacked_metadata.depth_map_list[0].shape, (400, 600))
         self.assertIsInstance(unpacked_metadata, mcs.StepMetadata)
-        self.assertAlmostEqual(unpacked_metadata.reward, -0.036000000000000004)
-        self.assertAlmostEqual(unpacked_metadata.rotation, 0.0, delta=1e-04)
-        self.assertIsInstance(unpacked_metadata.object_list[-1].shape, str)
+        self.assertEqual(unpacked_metadata.reward, 0.0)
+        self.assertEqual(unpacked_metadata.rotation, 0.0)
 
 
 if __name__ == '__main__':