diff --git a/solstone/apps/sol/maint/009_remove_granola_sync_schedule.py b/solstone/apps/sol/maint/009_remove_granola_sync_schedule.py
index 982163683..a3b140666 100644
--- a/solstone/apps/sol/maint/009_remove_granola_sync_schedule.py
+++ b/solstone/apps/sol/maint/009_remove_granola_sync_schedule.py
@@ -85,7 +85,7 @@ def run_migration(*, dry_run: bool) -> MigrationSummary:
 
     try:
         raw = json.loads(raw_bytes)
-    except json.JSONDecodeError:
+    except (UnicodeDecodeError, json.JSONDecodeError):
         summary.skipped_reason = "unparseable"
         return summary
 
diff --git a/tests/test_maint_009_remove_granola_sync_schedule.py b/tests/test_maint_009_remove_granola_sync_schedule.py
index efdc3e910..307713e63 100644
--- a/tests/test_maint_009_remove_granola_sync_schedule.py
+++ b/tests/test_maint_009_remove_granola_sync_schedule.py
@@ -250,6 +250,7 @@ def test_second_run_is_noop_and_does_not_rewrite_schedules_file(tmp_path):
         pytest.param(None, "no file", id="missing-file"),
         pytest.param(b"", "empty file", id="empty-file"),
         pytest.param(b"{not json", "unparseable", id="non-json"),
+        pytest.param(b"\xff\xfe\x00", "unparseable", id="invalid-utf8"),
         pytest.param(b"[]", "unparseable", id="non-dict"),
     ],
 )