Java Edition 1.8.4

1.8.4 is an update to Minecraft which was released on April 17, 2015 to fix various exploits and important security vulnerabilities  , as well as some other minor issues. 1.8.4 is compatible with 1.8 – 1.8.3 servers.

Changes

 * Player head skins can no longer be loaded from arbitrary servers.
 * They now require to be loaded from the official Mojang servers.
 * Player head skin files are now required to be a .png file.
 * Traveling through a nether portal, no longer places the player outside the portal.
 * Pets no longer follow the player in spectator mode; they are the wolf and the ocelot.