diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8187eff5..4d4b8e66 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,9 @@
  how a consumer would use the library or CLI tool (e.g. adding unit tests, updating documentation, etc) are not captured
  here.
 
+## 2.12.7 - 2026-11-02
+- Fixed an issue where some event queries would not serialize correctly.
+
 ## 2.12.6 - 2026-10-23
 
 ### Security
diff --git a/src/_incydr_sdk/__version__.py b/src/_incydr_sdk/__version__.py
index e3e70281..63047144 100644
--- a/src/_incydr_sdk/__version__.py
+++ b/src/_incydr_sdk/__version__.py
@@ -1,4 +1,4 @@
 # SPDX-FileCopyrightText: 2022-present Code42 Software <integrations@code42.com>
 #
 # SPDX-License-Identifier: MIT
-__version__ = "2.12.6"
+__version__ = "2.12.7"
diff --git a/src/_incydr_sdk/queries/file_events.py b/src/_incydr_sdk/queries/file_events.py
index 02968bbb..ac9f344f 100644
--- a/src/_incydr_sdk/queries/file_events.py
+++ b/src/_incydr_sdk/queries/file_events.py
@@ -112,7 +112,7 @@ class BaseEventQuery(Model):
     """
 
     group_clause: str = Field("AND", alias="groupClause")
-    groups: Optional[List[FilterGroup]]
+    groups: Optional[List[Union[FilterGroupV2, FilterGroup]]]
     model_config = ConfigDict(
         validate_assignment=True,
         use_enum_values=True,
diff --git a/tests/queries/test_event_query.py b/tests/queries/test_event_query.py
index 09a8f113..f56ebcde 100644
--- a/tests/queries/test_event_query.py
+++ b/tests/queries/test_event_query.py
@@ -321,6 +321,13 @@ def test_event_query_from_saved_search_creates_expected_filter_groups():
     assert isinstance(q.groups[2], FilterGroupV2)
 
 
+def test_event_query_from_saved_search_serializes_both_filter_group_types():
+    q = EventQuery().from_saved_search(TEST_SAVED_SEARCH)
+    dumped = q.model_dump()
+    for i in range(len(q.groups)):
+        assert q.groups[i].model_dump() == dumped["groups"][i]
+
+
 def test_event_query_is_any_creates_correct_filter():
     q = EventQuery().is_any("term", ["value1", "value2"])
     expected = FilterGroup(