diff --git a/synapse/http/server.py b/synapse/http/server.py
index 4b567215c8..3c7a0ef97a 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -38,6 +38,7 @@ import collections
import logging
import urllib
import ujson
+import simplejson
logger = logging.getLogger(__name__)
@@ -462,7 +463,7 @@ def respond_with_json(request, code, json_object, send_cors=False,
json_bytes = encode_canonical_json(json_object)
else:
# ujson doesn't like frozen_dicts.
- json_bytes = ujson.dumps(json_object, ensure_ascii=False)
+ json_bytes = simplejson.dumps(json_object)
return respond_with_json_bytes(
request, code, json_bytes,
diff --git a/synapse/rest/client/v2_alpha/sync.py b/synapse/rest/client/v2_alpha/sync.py
index a0a8e4b8e4..eb91c0b293 100644
--- a/synapse/rest/client/v2_alpha/sync.py
+++ b/synapse/rest/client/v2_alpha/sync.py
@@ -33,7 +33,7 @@ from ._base import set_timeline_upper_limit
import itertools
import logging
-import ujson as json
+import simplejson as json
logger = logging.getLogger(__name__)
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 3890878170..9fc65229fd 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -38,7 +38,7 @@ from functools import wraps
import synapse.metrics
import logging
-import ujson as json
+import simplejson as json
# these are only included to make the type annotations work
from synapse.events import EventBase # noqa: F401
diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py
index 86c3b48ad4..2e23dd78ba 100644
--- a/synapse/storage/events_worker.py
+++ b/synapse/storage/events_worker.py
@@ -28,7 +28,7 @@ from synapse.api.errors import SynapseError
from collections import namedtuple
import logging
-import ujson as json
+import simplejson as json
# these are only included to make the type annotations work
from synapse.events import EventBase # noqa: F401
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