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Unable to install along with the latest openapi-schema-validator #1188
Description
Actual Behavior
When the latest openapi-schema-validator is installed and one wants to add openapi-core (without version lock), the resulting installed version is 0.14.2.
Expected Behavior
The latest versions these libraries are installable together.
Steps to Reproduce
pip install openapi-schema-validator=0.9.0 openapi-core
OpenAPI Core Version
0.23.1
OpenAPI Core Integration
django
Affected Area(s)
This should be due to this version lock in openapi-core's pyproject.toml:
openapi-schema-validator = ">=0.7.0,<0.9.0"
References
No response
Anything else we need to know?
We have use cases for openapi-schema-validator where 0.8.1 fails and 0.9.0 works, and at the same time we rely on the latest openapi-core, so this incompatibility is a bit of a hassle. Can it be resolved?
Would you like to implement a fix?
None
Activity
janhn commentedon May 29, 2026
I get now that in order to get the same level of enforcement through validation with
openapi-schema-validator==0.9.0, we have to rewrite our schema to not rely on thediscriminator(changed in pr).p1c2u commentedon May 29, 2026
Thanks for the report. The cap was set because 0.9.0 includes the discriminator behavior change you mentioned.
It’s not a pure no-op bump; it’s a breaking change that will be part of openapi-core 0.24.x