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

bento
New Contributor

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!