How to update external library?

Hello!

I created 2 projects. The first is jar library. Second project includes this library. When I update my library (make and then build artifacts), in second project changes don't appear. For example:
1. Add new class in library (first project) SomeClass
2. Make, build artifacts
3. In second project when I create SomeClass object, it has red color, but project successfully compile.

How to say Idea to rescan classes from library?

P.S. Intellij IDEA Community edition 9.0.4, Windows XP SP3