Poetry Conflict: Importing Langchain-Postgres v^0.0.3 (current) + LangGraph v^0.0.48 (current)

[Wes Brooks]

I'm upgrading an existing streamlit based LCEL project to leverage LangGraph. The former project is heavily dependent upon langchain-postgres, especially for user account management via supabase postgres.

I was working through the new langgraph docs, to the point of adding memory. I started to evaluate switching to a sqlite db for simple memory management, but when looking at the docs for Checkpointing, it recommends using postgres for production workflows - which brings me back here.

When running poetry add langchain-potgres, it currently installs and forces langgraph 0.0.32, which seems significantly behind the current version of 0.0.48:

[package.dependencies]
langgraph = ">=0.0.32,<0.0.33"

When installing via git (poetry add git+https://github.com/langchain-ai/langchain-postgres.git), the dependency is loosened to this, which is what I see in the current poetry project in this repo:

[package.dependencies]
langgraph = "^0.0.32"

This still forces poetry to install langgraph at its lowest level dependency of 0.0.32.

Is there truly a dependency conflict for langchain-postgres with langgraph after 0.0.48? Or can the dependency be updated? Would love to be able to use langchain-postgres for langgraph checkpoints reliably. Would also love if the capability were documented/included in the next version of langgraph checkpoints (docs | repo)!

[Eugene Yurtsev]

Yeah the implementation was indeed tied to a specific version. The base implementation in langgraph has changed since so it's not compatible with the newest langgraph version. I have removed it from langchain-postgres (at least temporarily) to avoid confusing users.