⚠️ Breaking Changes Make PyMC and Pyro optional dependencies (#1835): pip install sbi no longer installs pymc or pyro-ppl. Users who need Pyro or PyMC MCMC samplers should install extras: pip install "sbi[pyro]" for Pyro samplers (hmc_pyro, nuts_pyro) pip install "sbi[pymc]" for PyMC samplers (slice_pymc, hmc_pymc, nuts_pymc) pip install "sbi[all]" for both Using a Pyro/PyMC method without the dependency installed raises a clear ImportError with install instructions. 🐛 Bug Fixes Fix TARP z-scoring bug (#1832): Reference points are now z-scored alongside thetas and posterior_samples when z_score_theta=True, fixing incorrect distance calculations that masked bias detection. Fix broken biased_toy_gaussian test helper: Rewrote to create actual location bias (posterior mean shifted from truth) instead of the previous NaN-producing formula. 📖 Documentation Streamlined README installation section, recommend uv as default. Added optional dependency install instructions to README, installation guide, and relevant tutorials. 🔧 Improvements Change default num_bins in TARP: run_tarp and _run_tarp now default to num_bins=None (auto-scales to num_sims // 10) instead of the hardcoded 30, improving KS test power for larger sample sizes. 🔒 Security Added SLSA build provenance attestations to the release workflow. Added Dependabot for automated GitHub Actions version updates. Added SECURITY.md with vulnerability disclosure policy. Fixed release uploads with --clobber flag.

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