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Release Notes

Always install the latest, stable version of MongoDB. See Version Numbers for more information.

See the following release notes for an account of the changes in major versions. Release notes also include instructions for upgrade.

Current Stable Release

(2.2-series)

See Changes in MongoDB 2.2 for an overview of all changes in 2.2.

Other MongoDB Release Notes

Version Numbers

There are three numbers in a MongoDB version:

<major version number>.<release number>.<revision number>

The second number, the release number, indicates release stability. An odd release number indicates a release in a development series. Even numbered releases indicate a stable, general availability, release.

Additionally, the three numbers indicate the following:

  • <major version number>: This rarely changes. A change to this number indicates very large changes to MongoDB.
  • <release number>: A release can include many changes, including new features and updates. Some changes may break backwards compatibility. See release notes for every version for compatibility notes. Even-numbered release numbers are stable branches. Odd-numbered release numbers are development branches.
  • <revision number>: This digit increments for every release. Changes each revision address bugs and security issues,

Example

Version numbers:

  • 1.0.0 : First stable release
  • 1.0.x : Bug fixes to 1.0.x. These releases carry low risk. Always upgrade to the latest revision in your release series.
  • 1.1.x : Development release. Includes new features not fully finished and other works-in-progress. Some things may be different than 1.0
  • 1.2.x : Second stable release. This is a culmination of the 1.1.x development series.