diff --git a/homeassistant/components/recorder/models.py b/homeassistant/components/recorder/models.py
index 3cc5c54e992..f3e80a9a739 100644
--- a/homeassistant/components/recorder/models.py
+++ b/homeassistant/components/recorder/models.py
@@ -3,7 +3,6 @@ from datetime import datetime
 import json
 import logging
 
-import orjson
 from sqlalchemy import (
     Boolean,
     Column,
@@ -64,7 +63,7 @@ class Events(Base):  # type: ignore
         try:
             return Event(
                 self.event_type,
-                orjson.loads(self.event_data),
+                json.loads(self.event_data),
                 EventOrigin(self.origin),
                 _process_timestamp(self.time_fired),
                 context=context,
@@ -134,7 +133,7 @@ class States(Base):  # type: ignore
             return State(
                 self.entity_id,
                 self.state,
-                orjson.loads(self.attributes),
+                json.loads(self.attributes),
                 _process_timestamp(self.last_changed),
                 _process_timestamp(self.last_updated),
                 context=context,
diff --git a/homeassistant/helpers/aiohttp_client.py b/homeassistant/helpers/aiohttp_client.py
index a90b8b61fb4..eee891b7f88 100644
--- a/homeassistant/helpers/aiohttp_client.py
+++ b/homeassistant/helpers/aiohttp_client.py
@@ -9,7 +9,6 @@ from aiohttp import web
 from aiohttp.hdrs import CONTENT_TYPE, USER_AGENT
 from aiohttp.web_exceptions import HTTPBadGateway, HTTPGatewayTimeout
 import async_timeout
-import orjson
 
 from homeassistant.const import EVENT_HOMEASSISTANT_CLOSE, __version__
 from homeassistant.core import Event, callback
@@ -68,7 +67,6 @@ def async_create_clientsession(
         loop=hass.loop,
         connector=connector,
         headers={USER_AGENT: SERVER_SOFTWARE},
-        json_serialize=lambda x: orjson.dumps(x).decode(),
         **kwargs,
     )
 
diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 9c3ea995210..cef7cda8017 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -16,7 +16,6 @@ home-assistant-frontend==20200220.1
 importlib-metadata==1.5.0
 jinja2>=2.10.3
 netdisco==2.6.0
-orjson==2.5.1
 pip>=8.0.3
 python-slugify==4.0.0
 pytz>=2019.03
diff --git a/homeassistant/util/json.py b/homeassistant/util/json.py
index ac64794d952..94dc816e03c 100644
--- a/homeassistant/util/json.py
+++ b/homeassistant/util/json.py
@@ -6,8 +6,6 @@ import os
 import tempfile
 from typing import Any, Dict, List, Optional, Type, Union
 
-import orjson
-
 from homeassistant.exceptions import HomeAssistantError
 
 _LOGGER = logging.getLogger(__name__)
@@ -30,7 +28,7 @@ def load_json(
     """
     try:
         with open(filename, encoding="utf-8") as fdesc:
-            return orjson.loads(fdesc.read())  # type: ignore
+            return json.loads(fdesc.read())  # type: ignore
     except FileNotFoundError:
         # This is not a fatal error
         _LOGGER.debug("JSON file not found: %s", filename)
@@ -99,7 +97,7 @@ def find_paths_unserializable_data(bad_data: Any) -> List[str]:
         obj, obj_path = to_process.popleft()
 
         try:
-            orjson.dumps(obj)
+            json.dumps(obj)
             continue
         except TypeError:
             pass
@@ -108,7 +106,7 @@ def find_paths_unserializable_data(bad_data: Any) -> List[str]:
             for key, value in obj.items():
                 try:
                     # Is key valid?
-                    orjson.dumps({key: None})
+                    json.dumps({key: None})
                 except TypeError:
                     invalid.append(f"{obj_path}<key: {key}>")
                 else:
diff --git a/pylintrc b/pylintrc
index 00e1621bb04..125062c8cfe 100644
--- a/pylintrc
+++ b/pylintrc
@@ -5,7 +5,7 @@ ignore=tests
 jobs=2
 load-plugins=pylint_strict_informational
 persistent=no
-extension-pkg-whitelist=ciso8601,orjson
+extension-pkg-whitelist=ciso8601
 
 [BASIC]
 good-names=id,i,j,k,ex,Run,_,fp
diff --git a/requirements_all.txt b/requirements_all.txt
index 8c4f0869417..edb4564aa72 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -10,7 +10,6 @@ importlib-metadata==1.5.0
 jinja2>=2.10.3
 PyJWT==1.7.1
 cryptography==2.8
-orjson==2.5.1
 pip>=8.0.3
 python-slugify==4.0.0
 pytz>=2019.03
diff --git a/setup.py b/setup.py
index 997e0595441..0564b7f4773 100755
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,6 @@ REQUIRES = [
     "PyJWT==1.7.1",
     # PyJWT has loose dependency. We want the latest one.
     "cryptography==2.8",
-    "orjson==2.5.1",
     "pip>=8.0.3",
     "python-slugify==4.0.0",
     "pytz>=2019.03",