+2  A: 

Dependencies and associations are two different concepts. According to the UML metamodel, both are two independent subclasses of the "Relationship" metaclass.

However, it is true, that in your scenario I'd just model an association between the two classes and not a dependency. The fact that the two classes are connected through an association already make them dependent.

Jordi Cabot
+1 for pointing out I misunderstood the relationship between associations and dependencies. Confirmed it by digging through the UML Superstructure specification from http://www.omg.org/spec/UML/2.2/
chrisbunney

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