[Python] Version dependency conflicts when adding langchain-google-genai to poetry project

I am adding the langchain-google-genai library to my project but poetry indicates it needs a higher pydantic version than the one I have, which conflicts with the pydantic version required the fastapi version of the project. How can I solve this?

poetry add langchain_google_genai

Using version ^1.0.7 for langchain-google-genai

Updating dependencies
Resolving dependencies... (30.6s)

Because no versions of langchain-core match >0.2.9,<0.2.10 || >0.2.10,<0.3
and langchain-core (0.2.9) depends on pydantic (>=2.7.4,<3.0.0), langchain-core (>=0.2.9,<0.2.10 || >0.2.10,<0.3) requires pydantic (>=2.7.4,<3.0.0).
And because langchain-core (0.2.10) depends on pydantic (>=2.7.4,<3.0.0), langchain-core (>=0.2.9,<0.3) requires pydantic (>=2.7.4,<3.0.0).
Because no versions of langchain-google-genai match >1.0.7,<2.0.0
and langchain-google-genai (1.0.7) depends on langchain-core (>=0.2.9,<0.3), langchain-google-genai (>=1.0.7,<2.0.0) requires langchain-core (>=0.2.9,<0.3).
(1) Thus, langchain-google-genai (>=1.0.7,<2.0.0) requires pydantic (>=2.7.4,<3.0.0).

Because no versions of fastapi match >0.96.0,<0.96.1 || >0.96.1,<0.97.0
and fastapi (0.96.0) depends on pydantic (>=1.6.2,<1.7 || >1.7,<1.7.1 || >1.7.1,<1.7.2 || >1.7.2,<1.7.3 || >1.7.3,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0), fastapi (>=0.96.0,<0.96.1 || >0.96.1,<0.97.0) requires pydantic (>=1.6.2,<1.7 || >1.7,<1.7.1 || >1.7.1,<1.7.2 || >1.7.2,<1.7.3 || >1.7.3,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0).
And because fastapi (0.96.1) depends on pydantic (>=1.7.4,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0), fastapi (>=0.96.0,<0.97.0) requires pydantic (>=1.6.2,<1.7 || >1.7,<1.7.1 || >1.7.1,<1.7.2 || >1.7.2,<1.7.3 || >1.7.3,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0).
And because langchain-google-genai (>=1.0.7,<2.0.0) requires pydantic (>=2.7.4,<3.0.0) (1), langchain-google-genai (>=1.0.7,<2.0.0) is incompatible with fastapi (>=0.96.0,<0.97.0)
So, because persualia-langserve depends on both fastapi (^0.96.0) and langchain-google-genai (^1.0.7), version solving failed.


I tried updating the fastapi version, trying to have one that matches the required version of pydantic by langchain-google-genai, but it broke my existing code.

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