diff --git a/requirements.txt b/requirements.txt
index 194d31e..90f06bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,2 @@
 pylint>2.0.0,<3.0.0
 typechecks >= 0.0.2,<1.0.0
-simplejson>=3.0.0,<4.0.0
diff --git a/serializable/helpers.py b/serializable/helpers.py
index 9b2662f..a2b9f78 100644
--- a/serializable/helpers.py
+++ b/serializable/helpers.py
@@ -14,10 +14,9 @@
 Helper functions for deconstructing classes, functions, and user-defined
 objects into serializable types.
 """
+import json
 from types import FunctionType, BuiltinFunctionType
 
-import simplejson as json
-
 from .primitive_types import return_primitive
 
 def init_arg_names(obj):
diff --git a/setup.py b/setup.py
index 2705335..77370c2 100644
--- a/setup.py
+++ b/setup.py
@@ -54,7 +54,6 @@
         ],
         install_requires=[
             "typechecks>=0.0.2",
-            "simplejson",
         ],
         long_description=readme,
         long_description_content_type='text/markdown',