diff --git a/zerver/tests/test_attachments.py b/zerver/tests/test_attachments.py
index e1f42d7871..a1a3bf2eed 100644
--- a/zerver/tests/test_attachments.py
+++ b/zerver/tests/test_attachments.py
@@ -3,7 +3,6 @@ from __future__ import absolute_import
 from __future__ import print_function
 
 import mock
-import ujson
 
 from typing import Any
 
diff --git a/zerver/tests/test_external.py b/zerver/tests/test_external.py
index dc84e96045..6ff438975d 100644
--- a/zerver/tests/test_external.py
+++ b/zerver/tests/test_external.py
@@ -21,7 +21,6 @@ from zerver.lib.test_classes import (
 import DNS
 import mock
 import time
-import ujson
 
 from six.moves import urllib
 from six.moves import range
diff --git a/zerver/tests/test_notifications.py b/zerver/tests/test_notifications.py
index 534d76048d..c180483dec 100644
--- a/zerver/tests/test_notifications.py
+++ b/zerver/tests/test_notifications.py
@@ -3,7 +3,6 @@ from __future__ import print_function
 
 import random
 import re
-import ujson
 
 from django.conf import settings
 from django.core import mail
diff --git a/zerver/tests/test_presence.py b/zerver/tests/test_presence.py
index e980ce8e94..9140cd39b5 100644
--- a/zerver/tests/test_presence.py
+++ b/zerver/tests/test_presence.py
@@ -26,7 +26,6 @@ from zerver.models import (
 )
 
 import datetime
-import ujson
 
 class ActivityTest(ZulipTestCase):
     def test_activity(self):
diff --git a/zerver/tests/test_realm_emoji.py b/zerver/tests/test_realm_emoji.py
index f394f81ea0..c8cf36023c 100644
--- a/zerver/tests/test_realm_emoji.py
+++ b/zerver/tests/test_realm_emoji.py
@@ -5,7 +5,6 @@ from zerver.lib.actions import get_realm, check_add_realm_emoji
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.test_helpers import get_test_image_file, get_user
 from zerver.models import RealmEmoji
-import ujson
 
 class RealmEmojiTest(ZulipTestCase):
 
diff --git a/zerver/tests/test_realm_filters.py b/zerver/tests/test_realm_filters.py
index 4490cd2aca..0cc03f815c 100644
--- a/zerver/tests/test_realm_filters.py
+++ b/zerver/tests/test_realm_filters.py
@@ -4,8 +4,6 @@ from __future__ import absolute_import
 from zerver.lib.actions import get_realm, do_add_realm_filter
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.models import RealmFilter
-import ujson
-
 
 class RealmFilterTest(ZulipTestCase):
 
diff --git a/zerver/tests/test_upload.py b/zerver/tests/test_upload.py
index 5275ec1ede..c94d246ff6 100644
--- a/zerver/tests/test_upload.py
+++ b/zerver/tests/test_upload.py
@@ -26,7 +26,6 @@ from zilencer.models import Deployment
 
 from zerver.views.upload import upload_file_backend
 
-import ujson
 from six.moves import urllib
 from PIL import Image