diff --git a/odmantic/model.py b/odmantic/model.py
index 08308f29..87c0bec2 100644
--- a/odmantic/model.py
+++ b/odmantic/model.py
@@ -4,6 +4,7 @@
 import decimal
 import enum
 import pathlib
+import types
 import uuid
 from abc import ABCMeta
 from collections.abc import Callable as abcCallable
@@ -193,7 +194,7 @@ def validate_type(type_: Type) -> Type:
         # FIXME: remove this hack when a better solution to handle dynamic
         # generics is found
         # https://github.com/pydantic/pydantic/issues/8354
-        if type_origin is Union:
+        if type_origin is Union or type_origin is getattr(types, "UnionType", Union):
             # as new_arg_types is a tuple, we can directly create a matching Union
             # instance, instead of hacking our way around it:
             # https://stackoverflow.com/a/72884529/3784643
diff --git a/tests/unit/test_model_definition.py b/tests/unit/test_model_definition.py
index 698090f3..8b69089f 100644
--- a/tests/unit/test_model_definition.py
+++ b/tests/unit/test_model_definition.py
@@ -528,3 +528,15 @@ class Person(Model):
         "hashed_password": "hashed_password",
     }
     Person(**user)
+
+
+@pytest.mark.skipif(
+    sys.version_info[:3] < (3, 10, 0),
+    reason="Union syntax not supported by python < 3.10",
+)
+def test_model_with_p310_union_syntax():
+    class M(Model):
+        f: int | str  # type: ignore[syntax]
+
+    assert M(f=1).f == 1
+    assert M(f="hello").f == "hello"