Bun Blog
Latest announcements of Bun.
Bun v1.3.5
Fixes 32 issues (addressing 25 👍). Bun.Terminal API, compile-time feature flags, improved Bun.stringWidth accuracy, V8 C++ value type checking APIs, Content-Disposition support for S3 uploads, environment variable expansion in .npmrc quoted values, and numerous bug fixes & node.js compatibility improvements
Wed Dec 17 2025•Changelog•Jarred Sumner
Bun v1.3.4
Fixes 194 issues (addressing 412 👍). URLPattern API, Fake Timers for bun:test, Custom Proxy Headers in fetch(),console.log %j format, http.Agent connection pooling fix, Standalone executable config loading changes, SQLite 3.51.1, and numerous bugfixes for bun:test, Node.js compatibility, Windows, Web APIs, bun install, and more
Sat Dec 06 2025•Changelog•Jarred Sumner
Bun is joining Anthropic
Bun has been acquired by Anthropic. Anthropic is betting on Bun as the infrastructure powering Claude Code, Claude Agent SDK, and future AI coding products & tools.
Tue Dec 02 2025•Jarred Sumner
Bun v1.3.3
Fixes 95 issues (addressing 348 👍). CompressionStream and DecompressionStream, Control .env and bunfig.toml loading in standalone executables, `retry` and `repeats` in `bun:test`, --no-env-file, SQLite 3.51.0, Upgraded to Zig 0.15.2, Bugfixes for bundler, bun install, Windows, Node.js compatibility, Web APIs, Bun.serve, networking, Bun.YAML, Bun.Transpiler, Bun.spawn & TypeScript definitions
Fri Nov 21 2025•Changelog•Jarred Sumner
Bun v1.3.2
Fixes 287 issues (addressing 324 👍). Hoisted installs restored as default for backward compatibility. CPU profiling with --cpu-prof, faster installs for packages with post-install scripts, bun:test onTestFinished hook, ServerWebSocket subscriptions getter, Alpine 3.22 in Docker images, improved Git dependency resolution, bun list alias, and numerous bug fixes across install, HTTP/HTTPS, N-API, bun test, bun build, and runtime.
Sat Nov 08 2025•Changelog•Jarred Sumner, Lydia Hallie
Bun v1.3.1
Fixes 103 issues (addressing 172 👍). 2× faster bun build on macOS for symlink-heavy projects, source maps preserve legal comments, and --format=cjs now inlines import.meta; bun test adds global vi, --pass-with-no-tests, and --only-failures; .npmrc :email auth support, faster installs when no peer deps, selective hoisting for isolated installs (publicHoistPattern/hoistPattern), and fs/promises FileHandle.readLines(); numerous bundler/transpiler fixes (external sourcemaps in Bun.build({ compile:true }), --bytecode with import.meta, Windows react-jsxdev); reliability fixes across install/pm/pack, bunx, Node.js compatibility improvements, and numerous bug fixes.
Wed Oct 22 2025•Changelog•Jarred Sumner
Bun 1.3
Bun 1.3 introduces zero-config frontend development, unified SQL API, built-in Redis client, security enhancements, package catalogs, async stack traces, VS Code test integration, and Node.js compatibility improvements.
Fri Oct 10 2025•Jarred, Lydia, Ciro, Dylan, Aidan, Alistair, Taylor, Marko, Michael, Zack