...
- Modify the ivy.xml file (by adding a new dependency, updating an existing dependency, or removing a dependency)
- Test the ivy.xml file (using the ant resolve task and checking the resulting libraries)
- Update the .classpath file (by adding entries for any new jar files from the project's lib directory, changing the jar file's name for a modified jar file version, or removing any entry which is no longer valid)by running ant create-dot-classpath which will update your Eclipse .classpath file with the latest jars.