Yes. There are other dependencies.
The full list of classes directly connected to Use Case is (fig. 18.1 of UML 2.5 standard) :
- Use Case
- Constraint
- Actor
- Include
- Extend
- Extension point
But that doesn't mean you can't use other UML elements in the diagram with Use Cases. UML standard DOESN'T limit any elements to diagrams. You can even use ALL UML elements on one diagram. On the other side, that would be senseless, of course.
A usable practical set can be seen, for example, looking on the elements on the Use Case palette of the VP UML, for example. Except already mentioned, there are:
- System
- Dependency
- Generalization
- Realization
- Collaboration
- Note
- Anchor
- Containment
here you can see a shortened list with explanations.
As you see, dependency is not only allowed by standard (all are), but widely used.