Download Latest Version v2.9.0_ Updated dependencies (pandas is now optional, gymnasium 1.3.0 support, torch_=2.8) source code.zip (1.5 MB)
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README.md 2026-06-15 1.4 kB
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v2.9.0_ Updated dependencies (pandas is now optional, gymnasium 1.3.0 support, torch_=2.8) source code.tar.gz 2026-06-15 1.4 MB
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v2.9.0_ Updated dependencies (pandas is now optional, gymnasium 1.3.0 support, torch_=2.8) source code.zip 2026-06-15 1.5 MB
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Totals: 3 Items   2.9 MB 0

Breaking Changes:

  • Relaxed Gymnasium version range (from "gymnasium>=0.29.1,<1.3.0" to "gymnasium>=0.29.1,<2.0")
  • pandas and matplotlib are no longer core dependencies; they are now optional and only required for loading results and plotting (moved to stable-baselines3[extra]).
  • Moved read_json and read_csv helper functions to test files
  • Raised torch minimum version from 2.3 to 2.8 to mitigate https://github.com/advisories/GHSA-887c-mr87-cxwp

Bug Fixes:

  • Fixed deprecated error Taxi-v3 from gymnasium v1.3.0 in tests

SB3-Contrib

  • Optimized tests (faster to run)
  • Fixed dead link for RecurrentPPO.

RL Zoo

SBX (SB3 + Jax)

  • Added support for rollout_buffer_class and rollout_buffer_kwargs arguments in PPO and OnPolicyAlgorithmJax constructors, as in Stable Baselines3. (@Trenza1ore)
  • Updated Jax dependency

Others:

  • Optimized tests (faster to run)
  • Add workflow to automatically publish to PyPi when a new tag is created

Documentation:

  • Added example for using torch.compile
  • Fixed many broken links and updated links to https whenever possible

Full Changelog: https://github.com/DLR-RM/stable-baselines3/compare/v2.8.0...v2.9.0

Source: README.md, updated 2026-06-15