diff --git a/RELEASES.rst b/RELEASES.rst
index 2d34181..ee4005b 100644
--- a/RELEASES.rst
+++ b/RELEASES.rst
@@ -1,6 +1,19 @@
 Releases
 ========
 
+0.4.1
+-----
+
+*Unreleased*
+
+- Use 'simplejson' package if available. (`#60`_, `#63`_)
+- Fix a bug where Choice Field didn't call super().validate(). (`#62`_)
+
+.. _#63: /~https://github.com/rossmacarthur/serde/pull/63
+.. _#62: /~https://github.com/rossmacarthur/serde/pull/62
+
+.. _#60: /~https://github.com/rossmacarthur/serde/issues/60
+
 0.4.0
 -----
 
diff --git a/setup.py b/setup.py
index 77fdf6d..49cb4d2 100644
--- a/setup.py
+++ b/setup.py
@@ -40,6 +40,9 @@ def get_metadata():
     'six >=1.0.0, <2.0.0',
     'validators >=0.12.0, <0.13.0'
 ]
+json_requires = [
+    'simplejson >=3.0.0, <4.0.0'
+]
 toml_requires = [
     'toml >=0.10.0, <0.11.0'
 ]
@@ -67,6 +70,7 @@ def get_metadata():
     # Options
     install_requires=install_requires,
     extras_require={
+        'json': json_requires,
         'toml': toml_requires,
         'yaml': yaml_requires,
         'dev.lint': lint_requires,
diff --git a/src/serde/model.py b/src/serde/model.py
index 3dcb82e..d2bab50 100644
--- a/src/serde/model.py
+++ b/src/serde/model.py
@@ -69,7 +69,6 @@
 
 """
 
-import json
 from collections import OrderedDict
 from contextlib import contextmanager
 from functools import wraps
@@ -84,6 +83,11 @@
 from serde.utils import dict_partition, try_import, zip_until_right
 
 
+try:
+    import simplejson as json
+except ImportError:
+    import json
+
 toml = try_import('toml')
 yaml = try_import('ruamel.yaml')