These are the changes of ARK: Survival Evolved’s Patch 181.1, grouped into categories for clarity. If not otherwise indicated, they’re quoted from the relevant Steam Thread.

Game Changes

• Increase absolute player Max Inventory Weight to 2x your Max Weight stat, rather than 1.2x

Bugfixes

• Fixed bug where amphibious dinosaurs were losing stamina in water (darn Mac/Linux compiler syntax issue)
• Fixed only getting 1 Engram Point for Levels 65 & 66 (this is not retroactive, but we’ll be implementing a respec option soon).
• Fixed a server crash

(Original Announcement on Steam)

Here are the patchnotes of the previous patch (181.0)