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Bump bitsandbytes from 0.44.1 to 0.49.1#507

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Bump bitsandbytes from 0.44.1 to 0.49.1#507
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dependabot/pip/bitsandbytes-0.49.1

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Bumps bitsandbytes from 0.44.1 to 0.49.1.

Release notes

Sourced from bitsandbytes's releases.

0.49.1

What's Changed

Full Changelog: bitsandbytes-foundation/bitsandbytes@0.49.0...0.49.1

0.49.0

Highlights

x86-64 CPU Improvements

CPU performance for 4bit is significantly improved on x86-64, with optimized kernel paths for CPUs that have AVX512 or AVX512BF16 support.

AMD ROCm Experimental Wheels

  • Experimental support for AMD devices is now included in our PyPI wheels on Linux x86-64.
  • We've added additional GPU target devices as outlined in our docs.
  • Support for using the default blocksize of 64 for 4bit was added for RDNA GPUs in #1748.

macOS 14+ Wheels

  • We're now publishing wheels for macOS 14+!
  • The 4bit and 8bit quantization features are supported on MPS by slow implementations. We plan to enable Metal kernels with improved performance in the future.

🚨 Breaking Changes

  • Dropped support for Python 3.9.
  • Dropped compilation support for Maxwell GPUs in the CUDA backend.

What's Changed

... (truncated)

Changelog

Sourced from bitsandbytes's changelog.

v0.45.1

Improvements:

  • Compatibility for triton>=3.2.0
  • Moved package configuration to pyproject.toml
  • Build system: initial support for NVIDIA Blackwell B100 GPUs, RTX 50 Blackwell series GPUs and Jetson Thor Blackwell.
    • Note: Binaries built for these platforms are not included in this release. They will be included in future releases upon the availability of the upcoming CUDA Toolkit 12.7 and 12.8.

Bug Fixes:

  • Packaging: wheels will no longer include unit tests. (#1478)

Dependencies:

  • Sets the minimum PyTorch version to 2.0.0.

0.45.0

This is a significant release, bringing support for LLM.int8() to NVIDIA Hopper GPUs such as the H100.

As part of the compatibility enhancements, we've rebuilt much of the LLM.int8() code in order to simplify for future compatibility and maintenance. We no longer use the col32 or architecture-specific tensor layout formats while maintaining backwards compatibility. We additionally bring performance improvements targeted for inference scenarios.

Performance Improvements

This release includes broad performance improvements for a wide variety of inference scenarios. See this X thread for a detailed explanation.

Breaking Changes

🤗PEFT users wishing to merge adapters with 8-bit weights will need to upgrade to peft>=0.14.0.

Packaging Improvements

  • The size of our wheel has been reduced by ~43.5% from 122.4 MB to 69.1 MB! This results in an on-disk size decrease from ~396MB to ~224MB.
  • Binaries built with CUDA Toolkit 12.6.2 are now included in the PyPI distribution.
  • The CUDA 12.5.0 build has been updated to CUDA Toolkit 12.5.1.

Deprecations

  • A number of public API functions have been marked for deprecation and will emit FutureWarning when used. These functions will become unavailable in future releases. This should have minimal impact on most end-users.
  • The k-bit quantization features are deprecated in favor of blockwise quantization. For all optimizers, using block_wise=False is not recommended and support will be removed in a future release.
  • As part of the refactoring process, we've implemented many new 8bit operations. These operations no longer use specialized data layouts.

Full Changelog

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@dependabot
Bump bitsandbytes from 0.44.1 to 0.49.1
d6f6ffe 
Bumps [bitsandbytes](https://github.com/bitsandbytes-foundation/bitsandbytes) from 0.44.1 to 0.49.1.
- [Release notes](https://github.com/bitsandbytes-foundation/bitsandbytes/releases)
- [Changelog](https://github.com/bitsandbytes-foundation/bitsandbytes/blob/main/CHANGELOG.md)
- [Commits](bitsandbytes-foundation/bitsandbytes@0.44.1...0.49.1)

---
updated-dependencies:
- dependency-name: bitsandbytes
  dependency-version: 0.49.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot bot added dependencies Pull requests that update a dependency file python Pull requests that update python code labels Jan 14, 2026
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dependabot bot commented on behalf of github Mar 2, 2026

Superseded by #635.

@dependabot dependabot bot closed this Mar 2, 2026
@dependabot dependabot bot deleted the dependabot/pip/bitsandbytes-0.49.1 branch March 2, 2026 06:02
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