Documentation for JIRA 5.0. Documentation for other versions of JIRA is available too. 
21 April 2010 The Atlassian JIRA team announces the release of JIRA 4.1.1. This point release is a highly recommended upgrade as it contains important fixes to security vulnerabilities in JIRA (listed below). For more information about these security vulnerabilities and patches to fix these vulnerabilities in earlier versions of JIRA, please refer to the JIRA Security Advisory 2010-04-16. Please also refer to the JIRA 4.1.1 Upgrade Guide for important changes in JIRA, which are designed to minimise the risk of security attacks.
JIRA 4.1.1 is of course free to all customers with active JIRA software maintenance.
Don't have JIRA 4.1 yet?
Take a look at all the new features in the JIRA 4.1 Release Notes and see what you are missing out on!
Upgrading from a Previous Version of JIRA
If you are upgrading, please read the JIRA 4.1.1 Upgrade Guide.
Updates and Fixes in this Release
JIRA 4.1.1 includes the following updates and bug fixes:
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