---
title: "Bun v1.3.13"
url: https://daily.dev/posts/bun-v1-3-13-1y7wi215s
source_url: https://bun.com/blog/bun-v1.3.13
type: article
source: "Bun"
published: 2026-04-20T07:54:04.250Z
updated: 2026-04-20T09:11:10.818Z
tags: ["javascript", "performance", "testing", "nodejs", "bun"]
reading_time: 20
upvotes: 2
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Bun v1.3.13

**[Bun](https://daily.dev/sources/bun)** · 20 min read · 2 upvotes · 0 comments

## Summary

Bun v1.3.13 ships a large set of new features and fixes. Key additions include `bun test --isolate` and `--parallel` for faster test suites with per-file isolation, `--shard` for splitting tests across CI jobs, and `--changed` to run only tests affected by git changes. `bun install` now streams tarballs to disk using 17x less memory. Source maps are rearchitected to use 8x less memory. gzip compression is up to 5.5x faster via zlib-ng. `Bun.serve()` gains Range request support for file-backed responses. SHA3 hash algorithms are added to WebCrypto and node:crypto. WebSocket clients now support ws+unix:// and wss+unix:// schemes. The JavaScriptCore engine is upgraded with 1,316 upstream commits. Dozens of Node.js compatibility fixes, crash fixes, and memory leak patches are also included.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://bun.com/blog/bun-v1.3.13>

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- [Bun v1.3.6](https://daily.dev/posts/bun-v1-3-6-wx4br4zyw) · Bun · 94 upvotes · 1 comments

---

Tags: [#javascript](https://daily.dev/tags/javascript), [#performance](https://daily.dev/tags/performance), [#testing](https://daily.dev/tags/testing), [#nodejs](https://daily.dev/tags/nodejs), [#bun](https://daily.dev/tags/bun)

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