diff --git a/renderapi/msgspec_json.py b/renderapi/msgspec_json.py
new file mode 100644
index 0000000..b110d31
--- /dev/null
+++ b/renderapi/msgspec_json.py
@@ -0,0 +1,49 @@
+import io
+import msgspec
+import numpy
+from typing import Any, Type
+
+
+def is_binary(f):
+    return isinstance(f, (io.RawIOBase, io.BufferedIOBase))
+
+
+def render_encode_hook(obj: Any) -> Any:
+    if isinstance(obj, numpy.integer):
+        return int(obj)
+    if isinstance(obj, numpy.floating):
+        return float(obj)
+    to_dict = getattr(obj, "to_dict", None)
+    if callable(to_dict):
+        return obj.to_dict()
+    else:
+        try:
+            return dict(obj)
+        except TypeError as e:
+            return obj.__dict__
+
+render_enc = msgspec.json.Encoder(enc_hook=render_encode_hook)
+
+
+class MsgSpecRenderJson:
+    @staticmethod
+    def loads(j, *args, **kwargs):
+        return msgspec.json.decode(j)
+
+    @staticmethod
+    def dumps(o, *args, **kwargs):
+        return render_enc.encode(o).decode()
+
+    @staticmethod
+    def dump(o, fp, *args, **kwargs):
+        if is_binary(fp):
+            fp.write(render_enc.encode(o))
+        else:
+            fp.write(render_enc.encode(o).decode())
+
+    @staticmethod
+    def load(fp, *args, **kwargs):
+        if is_binary(fp):
+            msgspec.json.decode(fp.read())
+        else:
+           msgspec.json.decode(fp.read())
diff --git a/renderapi/utils.py b/renderapi/utils.py
index c46b2fb..88031f4 100644
--- a/renderapi/utils.py
+++ b/renderapi/utils.py
@@ -18,12 +18,15 @@
 
 from .errors import RenderError
 
-# use ujson if installed for faster json
 try:
-    import ujson as requests_json
+    from .msgspec_json import MsgSpecRenderJson
+    default_json = MsgSpecRenderJson
 except ImportError:
-    import json as requests_json
-requests.models.complexjson = requests_json
+    default_json = json
+
+# default_json = MsgSpecRenderJson
+
+requests.models.complexjson = default_json
 
 
 class NullHandler(logging.Handler):
@@ -104,7 +107,7 @@ def post_json(session, request_url, d, params=None):
 
     headers = {"content-type": "application/json"}
     if d is not None:
-        payload = json.dumps(d)
+        payload = default_json.dumps(d)
     else:
         payload = None
         headers['Accept'] = "application/json"
@@ -235,7 +238,7 @@ def renderdumps(obj, *args, **kwargs):
         serialized object
     """
     cls_ = kwargs.pop('cls', RenderEncoder)
-    return json.dumps(obj, *args, cls=cls_, **kwargs)
+    return default_json.dumps(obj, *args, cls=cls_, **kwargs)
 
 
 def renderdump(obj, *args, **kwargs):
@@ -251,7 +254,7 @@ def renderdump(obj, *args, **kwargs):
         json.dump kwargs
     """
     cls_ = kwargs.pop('cls', RenderEncoder)
-    return json.dump(obj, *args, cls=cls_, **kwargs)
+    return default_json.dump(obj, *args, cls=cls_, **kwargs)
 
 
 def renderdump_temp(obj, *args, **kwargs):
diff --git a/test/test_utils.py b/test/test_utils.py
index a2500e6..ec45c03 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -3,7 +3,9 @@
 import renderapi
 import pytest
 import numpy as np
-import ujson
+import msgspec
+
+from renderapi.msgspec_json import MsgSpecRenderJson
 
 
 def cross_py23_reload(module):
@@ -13,27 +15,27 @@ def cross_py23_reload(module):
         importlib.reload(module)
 
 
-@pytest.mark.parametrize("use_ujson", [True, False])
-def test_json_load(use_ujson):
-    if not use_ujson:
+@pytest.mark.parametrize("use_msgspec", [True, False])
+def test_json_load(use_msgspec):
+    if not use_msgspec:
         try:
             import builtins
         except ImportError:
             import __builtin__ as builtins
         realimport = builtins.__import__
 
-        def noujson_import(name, globals=None, locals=None,
-                           fromlist=(), level=0):
-            if 'ujson' in name:
+        def no_msgspec_import(name, globals=None, locals=None,
+                              fromlist=(), level=0):
+            if 'msgspec' in name:
                 raise ImportError
             return realimport(name, globals, locals, fromlist, level)
-        builtins.__import__ = noujson_import
+        builtins.__import__ = no_msgspec_import
     cross_py23_reload(renderapi.utils)
-    assert (renderapi.utils.requests_json is ujson
-            if use_ujson else renderapi.utils.requests_json is json)
+    assert (renderapi.utils.default_json is MsgSpecRenderJson
+            if use_msgspec else renderapi.utils.default_json is json)
     assert (
-        renderapi.utils.requests.models.complexjson is ujson
-        if use_ujson else renderapi.utils.requests.models.complexjson is json)
+        renderapi.utils.requests.models.complexjson is MsgSpecRenderJson
+        if use_msgspec else renderapi.utils.requests.models.complexjson is json)
 
 
 def test_jbool():
@@ -45,7 +47,7 @@ def test_jbool():
 
 def test_renderdumps_simple():
     s = renderapi.utils.renderdumps({'a': 1})
-    assert(s == '{"a": 1}')
+    assert(s in ['{"a": 1}', '{"a":1}'])
 
     s = renderapi.utils.renderdumps(5)
     assert(s == '5')
diff --git a/test_requirements.txt b/test_requirements.txt
index 74e88cc..4746927 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -7,5 +7,5 @@ pytest-pep8>=1.0.6
 pytest-xdist>=1.14
 flake8>=3.0.4
 pylint>=1.5.4
-ujson
+msgspec
 jinja2