Here are the full patch notes for Update 21:

When you install on top of the Deluxe Edition, you are effectively holding the most complete Ghosts experience ever released.

: You get the full four-part episodic experience. While leaderboards for this mode are currently inconsistent, the gameplay—from the beginner-friendly Point of Contact to the brutal challenge of —remains a top-tier alternative to traditional Zombies. Why 2026 is the Year of the Ghost

In August 2018, Ghosts received a surprise 2.5 GB update (Version 1.21) on PS4 and Xbox One. While many players speculated it added Modern Warfare 4 easter eggs, the update primarily consisted of back-end stability fixes and anti-cheat improvements.