langchain: import error when importing `from langchain import OpenAI` on 0.0.151

got the following error when running today:

    from langchain.agents import MRKLChain, ReActChain, SelfAskWithSearchChain
  File "venv/lib/python3.11/site-packages/langchain/agents/__init__.py", line 2, in <module>
    from langchain.agents.agent import (
  File "venv/lib/python3.11/site-packages/langchain/agents/agent.py", line 17, in <module>
    from langchain.chains.base import Chain
  File "venv/lib/python3.11/site-packages/langchain/chains/__init__.py", line 2, in <module>
    from langchain.chains.api.base import APIChain
  File "venv/lib/python3.11/site-packages/langchain/chains/api/base.py", line 8, in <module>
    from langchain.chains.api.prompt import API_RESPONSE_PROMPT, API_URL_PROMPT
  File "venv/lib/python3.11/site-packages/langchain/chains/api/prompt.py", line 2, in <module>
    from langchain.prompts.prompt import PromptTemplate
  File "venv/lib/python3.11/site-packages/langchain/prompts/__init__.py", line 14, in <module>
    from langchain.prompts.loading import load_prompt
  File "venv/lib/python3.11/site-packages/langchain/prompts/loading.py", line 14, in <module>
    from langchain.utilities.loading import try_load_from_hub
  File "venv/lib/python3.11/site-packages/langchain/utilities/__init__.py", line 5, in <module>
    from langchain.utilities.bash import BashProcess
  File "venv/lib/python3.11/site-packages/langchain/utilities/bash.py", line 7, in <module>
    import pexpect
ModuleNotFoundError: No module named 'pexpect'

does this need to be added to project dependencies?