I'm using mvn 2.2.1, and when I try to build the embedded project its failing with: [WARNING] Rule 1: org.apache.maven.plugins.enforcer.RequireMavenVersion failed with message: Detected Maven Version: 2.2.1 is not in the allowed range [2.0.9,2.2.1). [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Some Enforcer rules have failed. Look above for specific messages explaining why the rule failed. [INFO] ------------------------------------------------------------------------ [INFO] For more information, run Maven with the -e switch [INFO] ------------------------------------------------------------------------ [INFO] Total time: 8 seconds [INFO] Finished at: Thu Dec 03 20:59:03 PST 2009 [INFO] Final Memory: 26M/80M [INFO] ------------------------------------------------------------------------ When I update the version range to allow 2.2.1 the build completes fine, so is there a known problem wiht 2.2.1 or was this just locked down prior to the release of that version?