Good point. If it's test-only, should be no risk. Although, hm, can this be expressed as test-only in SBT? If not then if it were 3.3 it would affect the final non-test artifact. Hm. Up to you all's judgment on that one. Heh, as it happens I did fix a bug in 3.3 in the Poisson distribution for CM: https://issues.apache.org/jira/browse/MATH-1056 Probably has no effect here.