After the release of Prefect 2.13.7, I can no longer have blocks with "SecretStr" in them? RuntimeError: no validator found for <class 'pydantic.types.SecretStr'>, see

arbitrary_types_allowed

in Config

from prefect.blocks.core import Block
from pydantic import SecretStr


class SMTPCredentials(Block):
    server: str
    port: int
    user: str
    password: SecretStr

Can you try

from pydantic.v1 import SecretStr

?

that fixed it, thank you!

So it’s something we’re aware of but should do a better job communicating / throwing errors. Creating an issue can help remind us this is an important paper cut

woot - same error. fixed it 🙂

Nice! Thank goodness for slack search lol

1000%. The normal interwebs did not help me here.

I ran into this as well. In case someone stumbles upon this thread thru slack search, here’s a solution that works with both pydantic 1 and 2:

try:
    from pydantic.v1 import SecretStr
except ImportError:
    from pydantic import SecretStr