Force Intellij IDEA to reread all maven dependencies
Press Ctrl+Shift+A to find actions, and input "reload", you will find the "Reload All Maven Projects".
On a Mac, use ⌘+⇧+A instead.
Open the "Maven Projects" tab/window and clicking the "Reimport All Maven Projects" in the upper left corner starts to reload all dependencies from their repositories. The status bar informs about the process.
What lets you think that this is not working correctly? Maybe any of the dependencies can't be load from the repository?