diff --git a/Lib/collections/_defaultdict.py b/Lib/collections/_defaultdict.py
index 007ca9104e..19b82bfb19 100644
--- a/Lib/collections/_defaultdict.py
+++ b/Lib/collections/_defaultdict.py
@@ -39,4 +39,24 @@ class defaultdict(dict):
             args = ()
         return type(self), args, None, None, iter(self.items())
 
+    def __or__(self, other):
+        if not isinstance(other, dict):
+            raise TypeError(f'unsupported operand type(s) for |: \'collections.{self.__class__.__qualname__}\' and \'{type(other).__qualname__}\'')
+
+        new = defaultdict(self.default_factory, self)
+        new.update(other)
+        return new
+
+    def __ror__(self, other):
+        if not isinstance(other, dict):
+            raise TypeError(f'unsupported operand type(s) for |: \'collections.{self.__class__.__qualname__}\' and \'{type(other).__qualname__}\'')
+
+        new = defaultdict(self.default_factory, other)
+        new.update(self)
+        return new
+
+    def __ior__(self, other):
+        self.update(other)
+        return self
+
 defaultdict.__module__ = 'collections'
diff --git a/Lib/test/test_defaultdict.py b/Lib/test/test_defaultdict.py
index 65376a37ef..68fc449780 100644
--- a/Lib/test/test_defaultdict.py
+++ b/Lib/test/test_defaultdict.py
@@ -150,8 +150,6 @@ class TestDefaultDict(unittest.TestCase):
             o = pickle.loads(s)
             self.assertEqual(d, o)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_union(self):
         i = defaultdict(int, {1: 1, 2: 2})
         s = defaultdict(str, {0: "zero", 1: "one"})