Astro 4.9.1 - Upgrade Experience
Tags: astro, vercel, webdev, programming
Published: 2024-05-27 14:33:38

There is so much more out there that can help you learn and build with Astro! Here is some educational content produced and maintained by the Astro community.

## Upgrade Astro
This guide covers how to update your version of Astro and related dependencies, how to learn what has changed from one version to the next, and how to understand Astro’s versioning system and corresponding documentation updates.

## What has changed?
The latest release of Astro is v4.9.1.

You can find an exhaustive list of all changes in Astro’s changelog, and important instructions for upgrading to each new major version in our upgrade guides.

## Upgrade to the latest version
Update your project’s version of Astro and all official integrations to the latest versions with one command using your package manager:

```
# Upgrade Astro and official integrations together
npx @astrojs/upgrade

```

## Manual Upgrading
To update Astro and integrations to their current versions manually, use the appropriate command for your package manager.

```
# Example: upgrade Astro with React and Tailwind integrations
npm install astro@latest @astrojs/react@latest @astrojs/tailwind@latest

```

## Install a specific version number
To install a specific version of Astro or integrations, use the appropriate command for your package manager.

```
npm install astro@4.5.3 @astrojs/react@3.0.10

```

## Documentation updates
This documentation is updated for each minor release and major version release. When new features are added, or existing usage changes, the docs will update to reflect the current behavior of Astro. If your project is not updated, then you may notice some behaviors do not match the up-to-date documentation.

New features are added to docs with the specific version number in which they were added. This means that if you have not updated to the latest release of Astro, some documented features may be unavailable. Always check the Added in: version number and make sure your project is updated before attempting to use new features!

If you have not upgraded to the latest major version of Astro, you may encounter significant differences between the Astro documentation and your project’s behavior. We strongly recommend upgrading to the current major version of Astro as soon as you are able. (If you're interested, here's the link to the [Instagram Story Viewer](https://storiesig.cfd/) ). Both the code and the documentation for earlier versions is unsupported.

## Upgrade Guides
After every major version release, you will find an upgrade guide with information about important changes and instructions for upgrading your project code.

The main Astro documentation pages are always accurate for the latest released version of Astro. They do not describe or compare to how things worked in previous versions, nor do they highlight updated or changed behavior.

See the upgrade guides below for an explanation of changes, comparing the new version to the old. The upgrade guides include everything that could require you to change your own code: breaking changes, deprecations, feature removals and replacements as well as updated usage guidance. Each change to Astro includes a “What should I do?” section to help you successfully update your project code.

## Older docs (unmaintained)
Documentation for older versions of Astro is not maintained, but is available as a static snapshot. Use these versions of docs if you are unable to upgrade your project, but still wish to consult guides and reference:

## Semantic versioning
Astro attempts to adhere as much as possible to semantic versioning, which is a set of rules developers use to determine how to assign a version number to a release. Semantic version follows a predictable pattern to inform users of the kind of changes they can expect from one version to the next.

Semantic versioning enforces a pattern of X.Y.Z for software version numbers. These values represent **major (X), minor (Y),** and **patch (Z)** updates.

## Patch changes
Patch changes are the least disruptive changes. They do not change the way you use Astro, and no change to your own code is required when you update.

When Astro issues a “patch” version, the last number increases. (e.g. astro@4.3.14 -> astro@4.3.15)

Patches may be released for reasons such as:

Internal changes that do not change Astro’s functionality:
refactors
performance improvements
increase or change in test coverage
aligning with stated documentation and expected behavior
Improvements to logging and error messages.
Re-releases after a failed release.
Patch changes also include most bug fixes, even in cases where users were taking advantage of existing unintended or undesirable behavior.

## Extended maintenance
The Core team will provide extended maintenance for security fixes only for one previous major version. This means that if the current major is v4.*, the Core team will back port security fixes and issue a new v3.* release.