Here you will find a description of the MyBB versioning scheme and release cycle as well as a listing of all MyBB versions released to date.

Version system

Starting with MyBB 1.2.0, MyBB uses a 3-number versioning system, x.y.z, where x is the major version number, y is the minor version number, and z is the maintenance and/or security patch release number.

The major version number is incremented when there is a major change in MyBB, such as a rewrite of the core.

The minor version number indicates one of two things. Even numbers (i.e. 2, 4, 6, etc) indicate public releases. Odd numbers (i.e. 3, 5, 7, etc) indicate a development version.

The maintenance/security patch version is incremented every time a security or maintenance update is released. These patches usually will not contain new features, but are usually crucial to the security or functionality of your forum.

Whatever the version number is, MyBB always urges users to upgrade to the latest version for the highest security of MyBB installations. Even minor patches that seem insignificant could protect from potentially critical security vulnerabilities.

Release cycle

Major releases

Major releases increment the major or minor version number (see version system above). Usually these will have new features and changes to the database schema, and therefore may break existing forum customizations, such as themes and plugins. Major releases may also contain security vulnerability patches and bug fixes.

Major releases usually end with a 0 (zero) in the version number (eg. x.y.0 or x.0.0) and usually mark the start of a new series.

MyBB's major releases to date include 1.00, 1.2.0, 1.4.0, 1.6.0, and 1.8.0.

Minor releases

Minor releases are produced as necessary in between major releases. They fall into two categories, but may be combined in a release. Customizations (plugins, themes, etc.) generally are compatible across releases in one series.

Security Vulnerability Patches

These are released as often as necessary to fix any known security holes. Upgrading should be completed as soon as possible, or forum security could be compromised.

Maintenance (Bug Fix) Releases

These releases fix bugs and small errors in MyBB. Upgrading is not as immediately necessary with simple maintenance releases as it is with security vulnerability patches, but it is recommended and encouraged to upgrade as soon as it is convenient.