[Maven 1.x] How to modify the version of the dependencies of a project ?

[Blaise Gosselin]

Hello,
 
I'd like to loop over all the dependencies and change their version number in a 
given version number.
I know how to loop over the dependencies of a project.
But I don't know if it is actually possible to modify the version of a 
dependency in a project.xml file ?
 
Any help is welcome... ;-)
Thanks in advance.
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bgOnline