# Astro 5.5

DevFeed: [Astro 5.5](<https://devfeed.tech/articles/astro-5-5-3242.md>)

Original publisher: [Read original article](<https://astro.build/blog/astro-550/>)

Author: Matt Kane

Published: 2025-03-13T00:00:00Z

Content type: release

Language: en

Sources: [The Astro Blog](<https://devfeed.tech/sources/the-astro-blog.md>)

Topics: [Astro](<https://devfeed.tech/topics/astro.md>), [Markdown](<https://devfeed.tech/topics/markdown.md>), [Syntax Highlighting](<https://devfeed.tech/topics/syntax-highlighting.md>), [TypeScript](<https://devfeed.tech/topics/typescript.md>), [Command-line interface](<https://devfeed.tech/topics/cli.md>)

Tags: [astro](<https://devfeed.tech/tags/astro.md>), [features](<https://devfeed.tech/tags/features.md>), [markdown](<https://devfeed.tech/tags/markdown.md>), [typescript](<https://devfeed.tech/tags/typescript.md>), [upgrade](<https://devfeed.tech/tags/upgrade.md>)

## AI overview

Astro 5.5 improves Markdown support for diagramming tools such as Mermaid and D2, adds type-safe experimental sessions with TypeScript, and improves heading ID compatibility with other Markdown processors. It also introduces an experimental option to preserve the order of style and script tags and provides CLI-based upgrade paths.

## Source excerpt

Astro 5.5 dives deep with better support for diagramming tools, improved Markdown compatibility, and type-safe sessions!