diff --git a/custom_components/hacs/utils/store.py b/custom_components/hacs/utils/store.py
index f0afa07b6bf..8150b5cc948 100644
--- a/custom_components/hacs/utils/store.py
+++ b/custom_components/hacs/utils/store.py
@@ -1,5 +1,7 @@
-"""Storage handers."""
+"""Storage handlers."""
 
+from awesomeversion import AwesomeVersion
+from homeassistant.const import __version__ as HAVERSION
 from homeassistant.helpers.json import JSONEncoder
 from homeassistant.helpers.storage import Store
 from homeassistant.util import json as json_util
@@ -8,6 +10,10 @@
 from ..exceptions import HacsException
 from .logger import LOGGER
 
+# serialize_in_event_loop=False is only available in HA 2025.12.0+
+# See: https://developers.home-assistant.io/blog/2025/11/25/storage-helper-opt-in-serialize-in-executor/
+_SERIALIZE_IN_EVENT_LOOP_SUPPORTED = AwesomeVersion(HAVERSION) >= "2025.12.0"
+
 _LOGGER = LOGGER
 
 
@@ -39,7 +45,10 @@ def get_store_key(key):
 
 def _get_store_for_key(hass, key, encoder):
     """Create a Store object for the key."""
-    return HACSStore(hass, VERSION_STORAGE, get_store_key(key), encoder=encoder, atomic_writes=True)
+    kwargs = {"encoder": encoder, "atomic_writes": True}
+    if _SERIALIZE_IN_EVENT_LOOP_SUPPORTED:
+        kwargs["serialize_in_event_loop"] = False
+    return HACSStore(hass, VERSION_STORAGE, get_store_key(key), **kwargs)
 
 
 def get_store_for_key(hass, key):
diff --git a/tests/utils/test_store.py b/tests/utils/test_store.py
index a0a3b9adb4b..ee69e5f734d 100644
--- a/tests/utils/test_store.py
+++ b/tests/utils/test_store.py
@@ -64,3 +64,24 @@ async def test_store_store(hass: HomeAssistant, caplog: pytest.LogCaptureFixture
 
         await async_save_to_store(hass, "test", {"test": "test"})
         assert async_save_mock.call_count == 1
+
+
+@pytest.mark.parametrize(
+    "ha_version, expected_supported",
+    [
+        ("2025.11.0", False),
+        ("2025.12.0", True),
+    ],
+)
+def test_serialize_in_event_loop_version_check(ha_version: str, expected_supported: bool) -> None:
+    """Test that serialize_in_event_loop flag is set based on HA version."""
+    from awesomeversion import AwesomeVersion
+
+    with patch(
+        "custom_components.hacs.utils.store._SERIALIZE_IN_EVENT_LOOP_SUPPORTED",
+        AwesomeVersion(ha_version) >= "2025.12.0",
+    ):
+        # Re-import to get the patched value
+        import custom_components.hacs.utils.store as store_module
+
+        assert expected_supported == store_module._SERIALIZE_IN_EVENT_LOOP_SUPPORTED