Notebook Langchain ModuleNotFoundError: No module named 'langchain.retrievers.merger_retriever'

[bento]

Hi,
As mentioned in the title, receiving this error despite

%pip install --upgrade langchain

Specific line of code:

from langchain.retrievers.merger_retriever import MergerRetriever

All other langchain import works when this is commented out. Same line works on my local VS Code.

Appreciate any help with this issue. Thanks!

[sean_owen · Accepted solution]

More specifically: langchain releases a new update every few days, and it is likely that you are using code or a library that needs a later version of langchain than you have (or, perhaps, a later version that removed whatever part of langchain you rely on). You need to figure out what version of langchain works for your use case and pin it. Updating to the latest version every time makes you vulnerable to breaking changes like this.