Bun 1.1.13 has been released with notable memory management improvements, including a 5% reduction in baseline memory usage, an upgraded memory allocator, and a Libpas scavenger implementation that returns unused memory to the OS faster. The release also adds testing enhancements such as isolate, parallel, and shard flags for the Jest-compatible test runner, plus up to 5x faster compression via zlib-ng. The update comes amid ongoing developer complaints about memory leaks and instability in long-running production workloads, with some teams migrating back to Node.js. Bun is now owned by Anthropic following its December 2025 acquisition.
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