diff --git a/backend/internal/repository/group_usage_rollup_trigger_integration_test.go b/backend/internal/repository/group_usage_rollup_trigger_integration_test.go
index db182be495..bd9059330a 100644
--- a/backend/internal/repository/group_usage_rollup_trigger_integration_test.go
+++ b/backend/internal/repository/group_usage_rollup_trigger_integration_test.go
@@ -130,6 +130,7 @@ func TestGroupUsageRollupTriggerSerializesInsertTransactionAcrossMidnight(t *tes
 	schema := createGroupUsageRollupTriggerTestSchema(t, ctx, false)
 	seedTx := beginGroupUsageRollupTriggerTestTx(t, ctx, schema)
 	_, err := seedTx.ExecContext(ctx, `
+		SET LOCAL TIME ZONE 'Asia/Shanghai';
 		INSERT INTO groups (id) VALUES (10);
 		INSERT INTO users (id) VALUES (1);
 		UPDATE usage_group_rollup_state
@@ -151,6 +152,8 @@ func TestGroupUsageRollupTriggerSerializesInsertTransactionAcrossMidnight(t *tes
 
 	insertTx := beginGroupUsageRollupTriggerTestTx(t, ctx, schema)
 	defer func() { _ = insertTx.Rollback() }()
+	_, err = insertTx.ExecContext(ctx, "SET LOCAL TIME ZONE 'Asia/Shanghai'")
+	require.NoError(t, err)
 	var insertBackendPID int
 	require.NoError(t, insertTx.QueryRowContext(ctx, "SELECT pg_backend_pid()").Scan(&insertBackendPID))
 
@@ -207,6 +210,7 @@ func TestGroupUsageRollupTriggerKeepsWatermarkForTodayInsert(t *testing.T) {
 	tx := beginGroupUsageRollupTriggerTestTx(t, ctx, schema)
 	defer func() { _ = tx.Rollback() }()
 	_, err := tx.ExecContext(ctx, `
+		SET LOCAL TIME ZONE 'Asia/Shanghai';
 		INSERT INTO groups (id) VALUES (10);
 		INSERT INTO users (id) VALUES (1);
 		UPDATE usage_group_rollup_state