Claude Code v2.1.181 uses Rust-rewritten Bun, 10% faster startup
Decision Brief
What changedStarting from v2.1.181, Claude Code uses a Rust port of Bun, boosting Linux startup by 10%.
Why it mattersSwitching to Rust-rewritten Bun means a more stable and faster JS runtime, improving Claude Code experience transparently.
Who should careAI coding tool users
Affected stackClaude Code
Builder actionUpgrade Claude Code to v2.1.181
Source confidenceMedium · Reliable media or first-hand reporting
According to Bun creator Jarred Sumner, Claude Code v2.1.181 (released June 17, 2026) and later versions have switched to a Rust-rewritten Bun. Confirmed by macOS arm64 running Bun v1.4.0 (earlier than public v1.3.14) and 563 .rs source files in the binary. Official says Linux startup improves ~10%, other platforms see minor changes. For Claude Code users, this upgrade is fully transparent—no action needed, just faster startup and potential stability gains.
Summary basis: full article readCompiled from the source scope noted above; the original remains authoritative.
Sources
- Simon Willison：Blog
Hands-on notes on LLM tools, local models, and practical AI engineering.
- Simon Willison：Blog
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