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 must now 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 (wolf and ocelot).