MongoDB Documentation, Release 3.0.4 Important: Always upgrade to the latest stable revision of your release series. The version numbering system for MongoDB differs from the system used for the MongoDB drivers. Drivers use only the first number to indicate a major version. For details, see drivers-version-numbers . Version numbers Example 12.4. MongoDB Version Numbers 925 • 2.0.0 : Stable release. • 2.0.1 : Revision. • 2.1.0 : Development release for testing only . Includes new features and changes for testing. Interfaces and stability may not be compatible in development releases. • 2.2.0 : Stable release. This is a culmination of the 2.1.x development series.