argon2_cffi has a very strong backward compatibility policy.
Generally speaking, you shouldn’t ever be afraid of updating.
If breaking changes are needed do be done, they are:
- …announced in the changelog.
- …the old behavior raises a
DeprecationWarningfor a year.
- …are done with another announcement in the changelog.
What explicitly may change over time are the default hashing parameters and the behavior of the CLI.