[HANDS-ON BUG] LunarLander-v2 is deprecated and needs to be changed to LunarLander-v3

[calebjubal]

🐛 Describe the Bug

The LunarLander-v2 environment is no longer available as expected. The API has been updated and the environment version has been incremented to LunarLander-v3, so calling:

env = gym.make("LunarLander-v2")

results in an error because v2 has been deprecated in favor of v3. This change was made upstream to fix environment determinism and wind generation behavior.([gymnasium.farama.org][1])

# v2 deprecated / fails now
env = gym.make("LunarLander-v3")

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📸 Screenshot

(Include a screenshot here of the error you’re seeing — e.g., VersionNotFound or similar.)

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📌 Material

• Did you use Google Colab?
  *Yes *

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💡 Notes

• The environment version change was introduced in recent gymnasium and related ecosystem updates — the v2 environments were updated to v3 to address determinism and randomness issues.
  gymnasium.farama.org

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[nebHailemariam]

It looks like this issue is likely caused by upgraded dependencies installed in Colab. Here’s how I was able to resolve it:

1. Comment out the original requirements line in the notebook:

!pip install -r https://raw.githubusercontent.com/huggingface/deep-rl-class/main/notebooks/unit1/requirements-unit1.txt

2. Install the dependencies using

!pip install stable-baselines3==2.0.0a5
!pip install swig
!pip install gymnasium
!pip install box2d-py
!pip install huggingface_sb3

I hope this helps!

[calebjubal]

Even this works but, still the HANDS-ON documentation is to be changed so that more people with less or basic developer knowledge won't stop engaging with the course.