Rimworld V1.4.3517 Apr 2026

As part of the broader 1.4 update landscape, this version supported:

was a critical hotfix update released during the active development cycle of the Biotech DLC and the 1.4 base game update. While it didn't introduce massive new features like the primary 1.4 patch, it focused on significant stability improvements and "quality of life" (QoL) refinements. Core Update Highlights RimWorld v1.4.3517

: Refinements were made to the then-new security buildings, such as the Foam Turret (which suppresses fires) and the Rocketswarm Launcher (effective against large groups of unarmored enemies). As part of the broader 1

: This version improved game stability, specifically targeting performance issues that arose with the new pollution and tox mechanics introduced in the Biotech expansion. : This version improved game stability

: Significant upgrades to the search bar functionality in various menus, making it easier to find specific items in large stockpiles.

: The introduction of toxic waste packs and the environmental hazards they create.

: 1.4.3517 addressed several underlying issues in the C# and XML codebases to help modders keep their content compatible with the evolving 1.4 framework. Notable Features in the 1.4 Era