Cannot install mathy

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When trying to install mathy, I get the following error:

$ pip install mathy
Collecting mathy
  Using cached mathy-0.9.5-py3-none-any.whl (9.5 kB)
Collecting numpy<1.23.0,>=1.21.0 (from mathy)
  Using cached numpy-1.22.4.zip (11.5 MB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Collecting colr (from mathy)
  Using cached Colr-0.9.1.tar.gz (116 kB)
  Preparing metadata (setup.py) ... done
Collecting srsly (from mathy)
  Using cached srsly-2.4.6-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (490 kB)
Collecting pydantic>=1.0.0 (from mathy)
  Using cached pydantic-1.10.8-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (3.1 MB)
Collecting typer<0.7.0,>=0.6.1 (from mathy)
  Using cached typer-0.6.1-py3-none-any.whl (38 kB)
Collecting wasabi (from mathy)
  Using cached wasabi-1.1.1-py3-none-any.whl (27 kB)
Collecting mathy-core<0.9.0,>=0.8.6 (from mathy)
  Using cached mathy_core-0.8.6-py3-none-any.whl (76 kB)
Collecting mathy-envs[gym]<0.12.0,>=0.11.4 (from mathy)
  Using cached mathy_envs-0.11.4-py3-none-any.whl (39 kB)
Collecting gym<0.21.0 (from mathy)
  Using cached gym-0.20.0.tar.gz (1.6 MB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      error in gym setup command: 'extras_require' must be a dictionary whose values are strings or lists of strings containing valid project/version requirement specifiers.
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.
$

Could you please help me?

Thanks in advance!

[justindujardin]

Sorry, this is not enough to reproduce your issue. I'll close it for now.

Feel free to reopen it with a complete reproduction case on the latest version of Mathy.