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-rw-r--r--synapse/api/filtering.py2
-rw-r--r--synapse/app/admin_cmd.py3
-rw-r--r--synapse/util/__init__.py2
-rw-r--r--synapse/util/frozenutils.py5
4 files changed, 6 insertions, 6 deletions
diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py
index 2a2c9e6f13..bb33345be6 100644
--- a/synapse/api/filtering.py
+++ b/synapse/api/filtering.py
@@ -15,10 +15,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import json
 from typing import List
 
 import jsonschema
-from canonicaljson import json
 from jsonschema import FormatChecker
 
 from synapse.api.constants import EventContentFields
diff --git a/synapse/app/admin_cmd.py b/synapse/app/admin_cmd.py
index b6c9085670..7d309b1bb0 100644
--- a/synapse/app/admin_cmd.py
+++ b/synapse/app/admin_cmd.py
@@ -14,13 +14,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import argparse
+import json
 import logging
 import os
 import sys
 import tempfile
 
-from canonicaljson import json
-
 from twisted.internet import defer, task
 
 import synapse
diff --git a/synapse/util/__init__.py b/synapse/util/__init__.py
index 3ad4b28fc7..b2355700ad 100644
--- a/synapse/util/__init__.py
+++ b/synapse/util/__init__.py
@@ -13,11 +13,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import json
 import logging
 import re
 
 import attr
-from canonicaljson import json
 
 from twisted.internet import defer, task
 
diff --git a/synapse/util/frozenutils.py b/synapse/util/frozenutils.py
index 0e445e01d7..bf094c9386 100644
--- a/synapse/util/frozenutils.py
+++ b/synapse/util/frozenutils.py
@@ -13,7 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from canonicaljson import json
+import json
+
 from frozendict import frozendict
 
 
@@ -66,5 +67,5 @@ def _handle_frozendict(obj):
 # A JSONEncoder which is capable of encoding frozendicts without barfing.
 # Additionally reduce the whitespace produced by JSON encoding.
 frozendict_json_encoder = json.JSONEncoder(
-    default=_handle_frozendict, separators=(",", ":"),
+    allow_nan=False, separators=(",", ":"), default=_handle_frozendict,
 )