Mac Launchpad icon jumps up I am running OS X El Capitan version 10.11.5 on a Macbook Air.

Recently, on two occasions, I saw the Launchpad icon in the Dock jumping up and down a few times and then it stopped.

On that moment I was not active on the computer. 

What could be the reason?
Do you have automatic updates activated for apps in the Mac App Store? You can check this under System Preferences -> App Store. (Not in the non-existent Preferences in the actual App Store app, which might be confusing.)

The Launchpad icon jumps when an application has been updated.