Uncharted 4: A Thief's End's multiplayer was recently patched to version 1.05.019 with a live update, which means that you don't actually need to download anything, because the changes are all server-side.

The full changelog was posted on the PlayStation Forums, and you can read it below.

Live Update 1.05.019 (MP Only)

MULTIPLAYER

GENERAL

  • Update to decrease chances of the idol being duplicated
  • Update to Network messaging
  • One-Use Booster chest has been reduced from 150 to 100 Relics
  • Blindfire reduction for all weapons and mods

MYSTICALS

  • Cintamani Stone
    • In game costs have been altered
    • Was – $400, $600, $900, & $1,200
    • Now – $400, $700, $1,050, & $1,400
    • Full Revive mod from is now $200
  • Staff of Ayar Manco
    • In game costs have been altered
    • Was – $300, $450, $750, $950, & $1,150
    • Now – $400, $500, $600, $900, & $1,100
  • Spirit of the Djinn
    • Loadout Point cost has been changed from 4 to 3
  • Indra's Eternity
    • Fix unlock requirements for the mods

GEAR

  • Mine
    • The player can now only have 2 mines deployed at one time (formerly 3)

WEAPONS

  • Aegis 9mm
    • Rate of fire decreased
    • Effective Range decreased
    • Recoil increased slightly
  • Jackal
    • Loadout Point cost removed, weapon is now FREE
    • Fire rate increased
    • Reload rate increase
    • Effective range increased
  • Spezzotti 12 Gauge
    • Effective range increased
    • Headshot damage multiplier increased
    • Loadout Point cost reduced to 5
  • M14 Custom
    • Loadout Point cost reduced to 5
  • MP34a
    • Reduce max ammo of MP34a from 120 to 90
  • Mettler M-30
    • Increase rate of fire
    • Decrease recoil in and out of scope aim
  • Raffica
    • Delay Between shots has been reduced

Interestingly, we also learn that info about an upcoming patch and DLC are in the pipeline, but Naughty Dog will share them when ready.