- 🎉 Lean 4.22.0 is here! It represents the culmination of our Year 2 roadmap! Including: 🧠 New grind tactic (SMT-style automated reasoning) 🏗️ New compiler (major performance foundation) Read the release notes: lean-lang.org/doc/reference/latest/releases/v4.22.0/ #LeanLang #LeanProverAug 15, 2025 19:40