diff --git a/django/tasks/utils.py b/django/tasks/utils.py
index c527ea2972..62bf928127 100644
--- a/django/tasks/utils.py
+++ b/django/tasks/utils.py
@@ -1,7 +1,6 @@
 import inspect
 import json
 import time
-from collections import deque
 from functools import wraps
 from traceback import format_exception
 
@@ -18,18 +17,6 @@ def is_global_function(func):
     return True
 
 
-def is_json_serializable(obj):
-    """
-    Determine, as efficiently as possible, whether an object is JSON-serializable.
-    """
-    try:
-        # HACK: JSON-encode an object, without loading it all into memory
-        deque(json.JSONEncoder().iterencode(obj), maxlen=0)
-        return True
-    except (TypeError, OverflowError):
-        return False
-
-
 def json_normalize(obj):
     """
     Round-trip encode object as JSON to normalize types.
diff --git a/tests/tasks/test_utils.py b/tests/tasks/test_utils.py
index c22e21ec20..47a8bb5ce2 100644
--- a/tests/tasks/test_utils.py
+++ b/tests/tasks/test_utils.py
@@ -48,22 +48,6 @@ class IsGlobalFunctionTestCase(SimpleTestCase):
         self.assertFalse(is_global_function_fixture.inner_func_is_global_function)
 
 
-class IsJSONSerializableTestCase(SimpleTestCase):
-    def test_serializable(self):
-        for example in [123, 12.3, "123", {"123": 456}, [], None]:
-            with self.subTest(example):
-                self.assertTrue(utils.is_json_serializable(example))
-
-    def test_not_serializable(self):
-        for example in [
-            self,
-            any,
-            datetime.datetime.now(),
-        ]:
-            with self.subTest(example):
-                self.assertFalse(utils.is_json_serializable(example))
-
-
 class JSONNormalizeTestCase(SimpleTestCase):
     def test_round_trip(self):
         self.assertEqual(utils.json_normalize({}), {})