https://wccftech.com/antimatter-switches-to-unreal-engine-5-pauses-83-development-to-focus-on-igi-origins/

Earlier this month, UK developer AntiMatter Games (known primarily for Rising Storm and Rising Storm 2: Vietnam) announced that it would switch to Unreal Engine 5 for its upcoming projects, the stealth game IGI: Origins and the cold-war based Rising Storm spiritual successor titled '83.

Rich Barham, CEO of AntiMatter Games, also said that the latter game has had its development paused while the studio focuses on completing IGI: Origins.