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# Amp [](https://travis-ci.org/amphp/amp)
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`amphp/amp` is a non-blocking concurrency framework for PHP applications. Learn more about Amp in the
[Guide ](https://stackedit.io/viewer#!url=https://raw.githubusercontent.com/amphp/amp/master/guide.md ).
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**Dependencies**
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- PHP 5.5+
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Optional PHP extensions may be used to improve performance in production environments and react to process control signals:
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- [php-uv ](https://github.com/chobie/php-uv ) extension for libuv backends
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**Maintained Versions**
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- v1.0.0 (PHP 5.5+)
- v1.1.0 (PHP 7+)
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Although there are no API breaks moving from v1.0 to v1.1 the newer release *does* require PHP 7. Amp follows the [semver ](http://semver.org/ ) semantic versioning specification. As a result, users may require any version >= 1.0.0 using the caret operator as shown below without backwards-compatibility issues. Composer will automatically retrieve the latest stable version available for your PHP environment.
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**Installation**
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```bash
$ composer require amphp/amp:^1
```
