These are the changes of ARK: Survival Evolved’s Patch 183.0, grouped into categories for clarity. If not otherwise indicated, they’re quoted from the relevant Steam Thread.

Official Servers

• New Primitive-Only Official Servers! Only stuff available that you might actually find in caveman-era tech, for role-playing fun. PvP, PvE, and PvP Hardcore in North America, EU, and OC. If players like this and the servers get crowded, we can add more 🙂

New Items / New Structures

• Added “Independence Fireworks” Skin for Flare Gun. Find it dropped from a variety of high-level dinos, and skin your Flares with this, to light up the night sky with a blazing fireworks display. Will only drop this weekend, so better stock up!

Dino Changes

• Fixed Ichthyosaurus losing taming affinity too fast and not being feedable quickly enough
• Dinos can no longer push you through structures 😉

Game Changes

• Server Admins can now explicitly remove items from the Supply Crate drops, to facilitate these primitive servers (a little later will expose the full loot tables for editing). We’ll be providing the INI’s used to setup these servers so that players can easily host their own Primitive-Era servers as they may wish.
• Mod makers can now override the minimap and spawn regions
• Made high level supply crates more likely to give high-level items
• Improved visual look/materials of Stone Structures

UI Changes

• Emote Wheel! 10 emotes for now Male and Female, along with two Emote Hotkey bindings.
• Added key for “Proximity Text Chat”, to say something in text chat only within a short audible range (has a unique text chat color)

Bugfixes

• Fixed a server-side crash
• Fixed case of clients unable to spawn in the online game / getting booted. Temporary solution before v183 until this new version is to TOTALLY delete your game directory and redownload the game (the issue is due to having some extra old map files in your Maps dir that need to be cleared out). v183 will ignore these however. Mega props to Steam User “crua9” for helping us to track this down!
• Fixed some collision gaps in stone tier (dinos could hit thru them, etc)
• Fixed a case where you could unprone into people’s bases.
• Fixed issue where swimming dinos were attempting to beach themselves to eat corpses 😛
• Made dinos able to properly damage structures again, in many cases a trace check was failing causing them to not do damage
• Hopeful fix for dinos appearing through floors when re-entering a zone or reloading a server
• Likely fix for case where Tribe data could be lost when reloading a server
• Fixed a case where “Take All From Inventory” could lose items if it would make your own Inventory greater than 2x overweight. Now it’ll stop if it reaches that.

Performance

• Improved server perf Phase 1

(Original Announcement on Steam)

Here are the patchnotes of the previous patch (182.1)