diff --git a/mode/utils/objects.py b/mode/utils/objects.py
index 70c73c3..8524841 100644
--- a/mode/utils/objects.py
+++ b/mode/utils/objects.py
@@ -472,6 +472,7 @@ def is_union(typ: Type) -> bool:
     name = typ.__class__.__name__
     return any(
         [
+            name == "UnionType",  # 3.10
             name == "_UnionGenericAlias",  # 3.9
             name == "_GenericAlias" and typ.__origin__ is typing.Union,  # 3.7
             name == "_Union",  # 3.6
diff --git a/tests/unit/utils/test_objects.py b/tests/unit/utils/test_objects.py
index 0e384af..a62f979 100644
--- a/tests/unit/utils/test_objects.py
+++ b/tests/unit/utils/test_objects.py
@@ -384,6 +384,7 @@ def test_label_pass():
         (int, False),
         (Union[int, bytes], True),
         (Optional[str], True),
+        (int | None, True),
     ],
 )
 def test_is_union(input, expected):