RedMica - the future Redmine you can get today - 4.2.0 released

On November 4, 2026 JST, version 4.2.0 of RedMica, Redmine-compatible open source software, was released.

RedMica 4.2.0 includes many new features and improvements, such as support for holidays and non-working dates, custom avatar uploads, Mermaid diagrams, and Gantt chart improvements.

You can download RedMica 4.2.0 from GitHub.

What is RedMica?

RedMica is Redmine-compatible open source software released by Far End Technologies Corporation, based on the Redmine source code. It is also used in My Redmine Global Edition, a cloud service operated by Far End Technologies Corporation.

Its main advantage is that regular releases at shorter intervals than Redmine let you use new features planned for upcoming Redmine releases ahead of time.

For example, during the roughly nine months between the release of Redmine 6.1.0 in September 2025 and Redmine 7.0.0 in June 2026, RedMica had two releases: 4.0 in November 2025 and 4.1 in May 2026. These releases made many of the new features in Redmine 7.0 available earlier. RedMica 4.2 now lets you use new features developed for the upcoming Redmine 7.1.0 release.

Highlights of New Features in RedMica 4.2.0

• Register holidays and non-working dates to exclude them from working-day calculations (details).
• Render Mermaid code blocks as diagrams (details).
• Remember and automatically adjust Gantt chart column widths, and highlight the entire row when hovering over it (column width details, highlighting details).
• Upload custom avatar images (details).
• Increase the default maximum number of attachments added at once from 10 to 50, and make the limit configurable (details).
• Select groups in User format custom fields (details).
• Link issue attachments to the history entry where they were added (details).
• Add the latest note author to the assignee dropdown and rename the group to "Author / Recent participants" (details).
• Filter project members by name, role, and status in project settings, and add pagination to member and group management pages (filtering details, pagination details).
• Add separate "Export issues" and "Export time entries" permissions (details).
• Preview PDF-compatible Adobe Illustrator files and RTF files (Illustrator details, RTF details).
• Add a REST API for managing documents (details).
• Set the default value of the private flag for new issues per tracker (details).
• Indent selected lines with Tab / Shift+Tab when editing CommonMark Markdown (details).
• Add an administration page listing all webhooks (details).

Before upgrading, check your Ruby version, as support for Ruby 3.2 has been dropped (details). Also, sudo mode is now enabled by default, so you will be asked to re-enter your password for sensitive operations, such as certain administrative actions (details).

A full list of changes is available in the CHANGELOG.