H2 1.4 is finally out of beta and can thus be bundled by MyWarp. As it involves a new storage engine, databases created in 1.4 cannot be read with older version. However, if 1.4 detects that a database is still using the old (1.3) storage engine, it should simply continue using it: https://stackoverflow.com/questions/43777788/whats-the-recommended-way-to-migrate-from-h2-1-3-175-to-1-4-195.

Before updating, this should be tested.