## Release Notes 

Always install the latest, stable version of MongoDB. See MongoDB Version Numbers (page 924) for more informa- tion. 

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

## 12.1 Current Stable Release 

( 3.0-series ) 

## 12.1.1 Release Notes for MongoDB 3.0 

March 3, 2015 

MongoDB 3.0 is now available. Key features include support for the WiredTiger storage engine, pluggable storage engine API, SCRAM-SHA-1 authentication mechanism, and improved explain functionality. 

MongoDB Ops Manager, which includes Automation, Backup, and Monitoring, is now also available. See the Ops Manager documentation 1 and the Ops Manager release notes 2 for more information. 

## Minor Releases 

## 3.0 Changelog 

## 3.0.4 Changelog 

## Security 

• SERVER-18475 3 authSchemaUpgrade fails when the system.users (page 291) contains non MONGODB-CR users 

• SERVER-18312 4 Upgrade PCRE to latest 

