All servers will be unavailable beginning at 1:00 AM PT (8 AM GMT) for maintenance to introduce a game update.  Downtime is anticipated to be less than 4 hours.

Players may note the following changes:

• Fixed an issue where IED's were not damaging bases
• Fixed an issue with arrows doing execessive base damage
• Adjusted the drop rate of the Patriotic Mask skin
• Fixed an exploit for sit command preventing falling damage
• Fixed an issue with the Skinning Knife not de-spawing when dropped on ground
• You should now be able to harvest blood from Zombies
• You can no longer chop trees with a hunting knife
• We have a potential fix in place for the invisibility issues introduced in the last update. 

Source: h1z1.com