Dependency cooldowns—delaying package installation to detect supply chain attacks—are emerging as coordinated ecosystem standard¶
Insight: Dependency cooldowns—delaying package installation by several days to allow community detection of compromises before widespread adoption—have gained coordinated adoption across major ecosystems. Between September 2025 and February 2026, pnpm, Yarn, Bun, Deno, uv, pip, and npm all implemented similar cooldown mechanisms, indicating convergence on this security practice.
Detail: This represents industry-wide response to supply chain vulnerabilities (like the LiteLLM attack). Rather than isolated tool decisions, this convergence suggests emerging ecosystem standards for safer dependency management that balance security against developer friction.