---
layout: releasenotes
title: Release Notes Mono 2.10.4
version: 2.10.4
releasedate: '2011-08-09'
---

Mono is a portable and open source implementation of the .NET framework for Unix, Windows, MacOS and other operating systems.

Mono 2.10.4 is a minor update to [Mono 2.10](/docs/about-mono/releases/2.10.0/), [Mono 2.10.1](/docs/about-mono/releases/2.10.1/), [Mono 2.10.2](/docs/about-mono/releases/2.10.2/), [Mono 2.10.3](/docs/about-mono/releases/2.10.3/) based on the mono-2-10 branch of github. Mono 2.10.4 was released on August 9th, 2011.

For more information on changes since Mono 2.10, you can also read the release notes for [Mono 2.10.1](/docs/about-mono/releases/2.10.1/), [Mono 2.10.2](/docs/about-mono/releases/2.10.2/) and [Mono 2.10.3](/docs/about-mono/releases/2.10.3/).

## Major Highlights

This release fixes a regression in the XmlSerializer that was introduced in Mono 2.10.3 and fixes a packaging issue for IronPython on MacOS X.