error: Potentially incompatible change required to top-level dependency

[thebarty]

When doing an meteor add practicalmeteor:mocha-xunit-reporter

I am getting

meteor add practicalmeteor:mocha-xunit-reporter
 => Errors while adding packages:             
                                              
While selecting package versions:
error: Potentially incompatible change required to top-level dependency: practicalmeteor:mocha 2.4.5_4, was 2.4.5_6.
Constraints on package "practicalmeteor:mocha":
* practicalmeteor:mocha@=2.4.5_4 <- practicalmeteor:mocha-console-runner 0.2.2

Can you bump versions?