Release 0.15.1

Security Updates

• cryptography 46.0.3 → 46.0.5 (fixes CVE-2026-26007)
• pillow 12.1.0 → 12.1.1 (fixes OOB Write vulnerability)
• nbconvert 7.16.6 → 7.17.0 (fixes CVE-2025-53000)

Bug Fixes

• Fix contradictory test assertion in test_agentk_perceives_time that expected relative_time to be None at the last negotiation step

CI/CD Improvements

• Add GitHub Actions concurrency control to cancel running workflows when a new push is made to the same branch (PRs continue running)

New Features

• Stability criteria system for utility functions with fine-grained caching
• MetaNegotiator classes for ensemble negotiation strategies
• SingletonOutcomeSpace and set operations for outcome spaces
• ExtendedOutcome.best_for() for multi-offer support
• Per-negotiator time and step limits in mechanisms
• LEAVE response type for negotiators to exit without ending negotiation
• allow_none_with_data parameter for information-only messages in SAO
• And many more improvements!

See HISTORY.rst for full details.

Installation

pip install --upgrade negmas