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langgraph dev asks for the installation of inmem which is already there #349

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opened 2026-02-20 17:38:01 -05:00 by yindo · 7 comments
yindo commented 2026-02-20 17:38:01 -05:00
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Originally created by @lfnovo on GitHub (Dec 12, 2024).

Checked other resources

  • This is a bug, not a usage question. For questions, please use GitHub Discussions.
  • I added a clear and detailed title that summarizes the issue.
  • I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
  • I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue.

Example Code

$ langgraph dev

Error Message and Stack Trace (if applicable)

Error: Required package 'langgraph-api-inmem' is not installed.
Please install it with:

    pip install -U "langgraph-cli[inmem]"

If you're developing the langgraph-cli package locally, you can install in development mode:
    pip install -e .

Description

I can't get the langgraph dev command to work. It asks me to install inmem which I already did.

System Info

System Information

OS: Darwin
OS Version: Darwin Kernel Version 24.2.0: Fri Dec 6 18:51:28 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8112
Python Version: 3.10.6 (main, Jul 1 2024, 15:34:22) [Clang 15.0.0 (clang-1500.3.9.4)]

Package Information

langchain_core: 0.3.24
langchain: 0.3.11
langchain_community: 0.3.11
langsmith: 0.2.3
langchain_anthropic: 0.3.0
langchain_text_splitters: 0.3.2
langgraph_cli: 0.1.61
langgraph_sdk: 0.1.43

Optional packages not installed

langserve

Other Dependencies

aiohttp: 3.11.10
anthropic: 0.39.0
async-timeout: 4.0.3
click: 8.1.7
dataclasses-json: 0.6.7
defusedxml: 0.7.1
httpx: 0.27.2
httpx-sse: 0.4.0
jsonpatch: 1.33
langgraph-api: Installed. No version info available.
langsmith-pyo3: Installed. No version info available.
numpy: 1.26.4
orjson: 3.10.12
packaging: 24.2
pydantic: 2.10.3
pydantic-settings: 2.6.1
python-dotenv: 1.0.1
PyYAML: 6.0.2
requests: 2.32.3
requests-toolbelt: 1.0.0
SQLAlchemy: 2.0.36
tenacity: 9.0.0
typing-extensions: 4.12.2

Originally created by @lfnovo on GitHub (Dec 12, 2024). ### Checked other resources - [X] This is a bug, not a usage question. For questions, please use GitHub Discussions. - [X] I added a clear and detailed title that summarizes the issue. - [X] I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example). - [X] I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue. ### Example Code ```python $ langgraph dev ``` ### Error Message and Stack Trace (if applicable) ```shell Error: Required package 'langgraph-api-inmem' is not installed. Please install it with: pip install -U "langgraph-cli[inmem]" If you're developing the langgraph-cli package locally, you can install in development mode: pip install -e . ``` ### Description I can't get the langgraph dev command to work. It asks me to install inmem which I already did. ### System Info System Information ------------------ > OS: Darwin > OS Version: Darwin Kernel Version 24.2.0: Fri Dec 6 18:51:28 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8112 > Python Version: 3.10.6 (main, Jul 1 2024, 15:34:22) [Clang 15.0.0 (clang-1500.3.9.4)] Package Information ------------------- > langchain_core: 0.3.24 > langchain: 0.3.11 > langchain_community: 0.3.11 > langsmith: 0.2.3 > langchain_anthropic: 0.3.0 > langchain_text_splitters: 0.3.2 > langgraph_cli: 0.1.61 > langgraph_sdk: 0.1.43 Optional packages not installed ------------------------------- > langserve Other Dependencies ------------------ > aiohttp: 3.11.10 > anthropic: 0.39.0 > async-timeout: 4.0.3 > click: 8.1.7 > dataclasses-json: 0.6.7 > defusedxml: 0.7.1 > httpx: 0.27.2 > httpx-sse: 0.4.0 > jsonpatch: 1.33 > langgraph-api: Installed. No version info available. > langsmith-pyo3: Installed. No version info available. > numpy: 1.26.4 > orjson: 3.10.12 > packaging: 24.2 > pydantic: 2.10.3 > pydantic-settings: 2.6.1 > python-dotenv: 1.0.1 > PyYAML: 6.0.2 > requests: 2.32.3 > requests-toolbelt: 1.0.0 > SQLAlchemy: 2.0.36 > tenacity: 9.0.0 > typing-extensions: 4.12.2
yindo closed this issue 2026-02-20 17:38:01 -05:00
yindo commented 2026-02-20 17:38:02 -05:00
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@rafael-siqueira-akad commented on GitHub (Dec 12, 2024):

I have the same issue :/

@rafael-siqueira-akad commented on GitHub (Dec 12, 2024): I have the same issue :/
yindo commented 2026-02-20 17:38:02 -05:00
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@hinthornw commented on GitHub (Dec 13, 2024):

If you run with uv does it work?

curl -LsSf https://astral.sh/uv/install.sh | sh

uvx --refresh --from "langgraph-cli[inmem]" --with-editable . --python 3.11 langgraph dev

I think the issue may be one of python package managing, where you may have two installations of langgraph-cli (one in your virtual environment, one global), and when you run the CLI it might be calling the globally installed one rather than the local one

I'll try to think of how I can better work around python's packaging woes here

@hinthornw commented on GitHub (Dec 13, 2024): If you run with `uv` does it work? ```bash curl -LsSf https://astral.sh/uv/install.sh | sh ``` ``` uvx --refresh --from "langgraph-cli[inmem]" --with-editable . --python 3.11 langgraph dev ``` I think the issue may be one of python package managing, where you may have two installations of langgraph-cli (one in your virtual environment, one global), and when you run the CLI it might be calling the globally installed one rather than the local one I'll try to think of how I can better work around python's packaging woes here
yindo commented 2026-02-20 17:38:02 -05:00
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@Liboul commented on GitHub (Dec 26, 2024):

If you run with uv does it work?

curl -LsSf https://astral.sh/uv/install.sh | sh

uvx --refresh --from "langgraph-cli[inmem]" --with-editable . --python 3.11 langgraph dev

I think the issue may be one of python package managing, where you may have two installations of langgraph-cli (one in your virtual environment, one global), and when you run the CLI it might be calling the globally installed one rather than the local one

I'll try to think of how I can better work around python's packaging woes here

Encountered the same issue, uvx command worked for me. I have neither langgraph-cli nor langgraph-api installed in the virtual environment (poetry), only globally.

Here's what also worked:

  1. Removing the globally installed cli
  2. Install latest version of langgraph-cli in the virtual env
  3. Upgrade langgraph-sdk to latest version
  4. Run langgraph dev in the virtual shell
@Liboul commented on GitHub (Dec 26, 2024): > If you run with `uv` does it work? > > ```shell > curl -LsSf https://astral.sh/uv/install.sh | sh > ``` > > ``` > uvx --refresh --from "langgraph-cli[inmem]" --with-editable . --python 3.11 langgraph dev > ``` > > I think the issue may be one of python package managing, where you may have two installations of langgraph-cli (one in your virtual environment, one global), and when you run the CLI it might be calling the globally installed one rather than the local one > > I'll try to think of how I can better work around python's packaging woes here Encountered the same issue, `uvx` command worked for me. I have neither `langgraph-cli` nor `langgraph-api` installed in the virtual environment (poetry), only globally. Here's what also worked: 1. Removing the globally installed cli 2. Install latest version of `langgraph-cli` in the virtual env 3. Upgrade langgraph-sdk to latest version 4. Run `langgraph dev` in the virtual shell
yindo commented 2026-02-20 17:38:02 -05:00
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@lucacitta commented on GitHub (Dec 26, 2024):

I tried the suggested solution, but unfortunately, it didn’t work. However, I just found a way to get it working!

It seems there’s an issue with langgraph-cli[inmem] and the Python version being used. I was using Python 3.10, and when I ran pip install langgraph-cli[inmem], it didn’t install langgraph-api.

When I attempted to install langgraph-api manually, I encountered an error stating that langgraph-api requires Python > 3.11.

After upgrading to Python 3.13, I installed langgraph-cli[inmem] again, and everything started working!

I believe the root issue is that when you install langgraph-cli[inmem], it doesn’t explicitly notify you that langgraph-api failed to install due to an unmet version requirement. This can lead to confusion if you have an incompatible Python version.

Hope it helps!

@lucacitta commented on GitHub (Dec 26, 2024): I tried the suggested solution, but unfortunately, it didn’t work. However, I just found a way to get it working! It seems there’s an issue with `langgraph-cli[inmem]` and the Python version being used. I was using Python 3.10, and when I ran `pip install langgraph-cli[inmem]`, it didn’t install `langgraph-api`. When I attempted to install `langgraph-api` manually, I encountered an error stating that `langgraph-api` requires Python > 3.11. After upgrading to Python 3.13, I installed `langgraph-cli[inmem]` again, and everything started working! I believe the root issue is that when you install `langgraph-cli[inmem]`, it doesn’t explicitly notify you that `langgraph-api` failed to install due to an unmet version requirement. This can lead to confusion if you have an incompatible Python version. Hope it helps!
yindo commented 2026-02-20 17:38:02 -05:00
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@hinthornw commented on GitHub (Jan 9, 2025):

Yes the API server requires python 3.11 or later

@hinthornw commented on GitHub (Jan 9, 2025): Yes the API server requires python 3.11 or later
yindo commented 2026-02-20 17:38:02 -05:00
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@wuhaolei455 commented on GitHub (Apr 28, 2025):

work for me!

@wuhaolei455 commented on GitHub (Apr 28, 2025): work for me!
yindo commented 2026-02-20 17:38:02 -05:00
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@KyoungWan commented on GitHub (Jul 29, 2025):

For who encounter the problem with langgraph version 0.3.6

If you install langgraph with brew and run langgraph dev in the virtual env, you will get the above error.
I solved it by uninstalling langgraph from brew.

@KyoungWan commented on GitHub (Jul 29, 2025): For who encounter the problem with langgraph version `0.3.6` If you install langgraph with brew and run `langgraph dev` in the virtual env, you will get the above error. I solved it by uninstalling langgraph from brew.
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Reference: langchain-ai/langgraph#349
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