diff --git a/synapse/rest/client/v1/directory.py b/synapse/rest/client/v1/directory.py
index 8ed7e2d669..420aa89f38 100644
--- a/synapse/rest/client/v1/directory.py
+++ b/synapse/rest/client/v1/directory.py
@@ -20,7 +20,7 @@ from synapse.api.errors import AuthError, SynapseError, Codes
from synapse.types import RoomAlias
from .base import ClientV1RestServlet, client_path_pattern
-import json
+import simplejson as json
import logging
diff --git a/synapse/rest/client/v1/login.py b/synapse/rest/client/v1/login.py
index 7116ac98e8..b2257b749d 100644
--- a/synapse/rest/client/v1/login.py
+++ b/synapse/rest/client/v1/login.py
@@ -19,7 +19,7 @@ from synapse.api.errors import SynapseError
from synapse.types import UserID
from base import ClientV1RestServlet, client_path_pattern
-import json
+import simplejson as json
class LoginRestServlet(ClientV1RestServlet):
diff --git a/synapse/rest/client/v1/presence.py b/synapse/rest/client/v1/presence.py
index 7feb4aadb1..78d4f2b128 100644
--- a/synapse/rest/client/v1/presence.py
+++ b/synapse/rest/client/v1/presence.py
@@ -21,7 +21,7 @@ from synapse.api.errors import SynapseError
from synapse.types import UserID
from .base import ClientV1RestServlet, client_path_pattern
-import json
+import simplejson as json
import logging
logger = logging.getLogger(__name__)
diff --git a/synapse/rest/client/v1/profile.py b/synapse/rest/client/v1/profile.py
index 15d6f3fc6c..1e77eb49cf 100644
--- a/synapse/rest/client/v1/profile.py
+++ b/synapse/rest/client/v1/profile.py
@@ -19,7 +19,7 @@ from twisted.internet import defer
from .base import ClientV1RestServlet, client_path_pattern
from synapse.types import UserID
-import json
+import simplejson as json
class ProfileDisplaynameRestServlet(ClientV1RestServlet):
diff --git a/synapse/rest/client/v1/push_rule.py b/synapse/rest/client/v1/push_rule.py
index c4e7dfcf0e..b012f31084 100644
--- a/synapse/rest/client/v1/push_rule.py
+++ b/synapse/rest/client/v1/push_rule.py
@@ -27,7 +27,7 @@ from synapse.push.rulekinds import (
PRIORITY_CLASS_MAP, PRIORITY_CLASS_INVERSE_MAP
)
-import json
+import simplejson as json
class PushRuleRestServlet(ClientV1RestServlet):
diff --git a/synapse/rest/client/v1/pusher.py b/synapse/rest/client/v1/pusher.py
index 80e9939b79..6045e86f34 100644
--- a/synapse/rest/client/v1/pusher.py
+++ b/synapse/rest/client/v1/pusher.py
@@ -19,7 +19,7 @@ from synapse.api.errors import SynapseError, Codes
from synapse.push import PusherConfigException
from .base import ClientV1RestServlet, client_path_pattern
-import json
+import simplejson as json
class PusherRestServlet(ClientV1RestServlet):
diff --git a/synapse/rest/client/v1/register.py b/synapse/rest/client/v1/register.py
index c0423c2d45..d3399c446b 100644
--- a/synapse/rest/client/v1/register.py
+++ b/synapse/rest/client/v1/register.py
@@ -25,7 +25,7 @@ from synapse.util.async import run_on_reactor
from hashlib import sha1
import hmac
-import json
+import simplejson as json
import logging
import urllib
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 410f19ccf6..0346afb1b4 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -23,7 +23,7 @@ from synapse.api.constants import EventTypes, Membership
from synapse.types import UserID, RoomID, RoomAlias
from synapse.events.utils import serialize_event
-import json
+import simplejson as json
import logging
import urllib
diff --git a/synapse/rest/client/v2_alpha/filter.py b/synapse/rest/client/v2_alpha/filter.py
index 6ddc495d23..703250cea8 100644
--- a/synapse/rest/client/v2_alpha/filter.py
+++ b/synapse/rest/client/v2_alpha/filter.py
@@ -21,7 +21,7 @@ from synapse.types import UserID
from ._base import client_v2_pattern
-import json
+import simplejson as json
import logging
diff --git a/synapse/rest/media/v0/content_repository.py b/synapse/rest/media/v0/content_repository.py
index 22e26e3cd5..e77a20fb2e 100644
--- a/synapse/rest/media/v0/content_repository.py
+++ b/synapse/rest/media/v0/content_repository.py
@@ -25,7 +25,7 @@ from twisted.web import server, resource
from twisted.internet import defer
import base64
-import json
+import simplejson as json
import logging
import os
import re
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