As email is not the Id field, I would use a Query (typed, named or native) first to get the Curriculum object to be updated, then I would update it by EntityManager.merge:
EntityManager em = ...
TypedQuery<Curriculum> query = em.createQuery(
"SELECT c FROM Curriculum c " +
"WHERE c.email = :p1",
Curriculum.class);
query.setParameter("p1", "myemail@myhost.com");
Curriculum curriculum = (Curriculum) query.getSingleResult();
curriculum.setSenha("mypwd");
em.merge(curriculum);