🛠️ Hearts of Iron IV update history
Official announcements the developer posts on Steam—patches, new content, and events—sorted by date. Click a title to read the full post.
October 2026
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10/22Thu📢 AnnouncementHOI IV Dev Diary | Romania: A Flawed Democracy
Generals! Greetings, I’m Norrman and I’ve been working with Marijn and Alex on the upcoming Romania Focus Pack and I will cover the first part of this Dev Diary. Some quick notes about me before I mov…
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10/7Wed📢 AnnouncementDev Corner & Open Beta: Energy #2
Hello again! After a lot of reactions last week, we’ve made some changes. We are still not sure if we should release this or not, but based on the reactions we also decided to make this an open beta. …
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10/6Tue📢 AnnouncementHOI IV Dev Corner | Strikes!
Hello there! Your feedback has been much appreciated, both with civil wars and old Canada content. So I come here once again to ask you what do you think about…. Strikes! (As in the labour history, wo…
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10/1Thu📢 AnnouncementHOI IV Dev Corner | Energy
Generals! Something different, not planned for any expansion, but perhaps a future war effort. We added coal to the game as part of the free update released with No Compromise, No Surrender. However, …
September 2026
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9/29Tue📢 AnnouncementHOI IV Dev Corner - Old Canada Questions Before New Canada
Generals!Another week, another Dev Corner. Read through and give us your relevant feedback.Hello all! I'm the content designer working on Canada (obviously the most important nation in the DLC), and I…
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9/22Tue📢 AnnouncementHOI IV Dev Corner | The Great Depression
Hey, folks! This is your friendly neighborhood ImaginedPanda, content designer on Heart of Iron, coming to you with today's Dev Corner. For our current iteration we will be talking about economic woes…
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9/15Tue📢 AnnouncementHOI IV Dev Corner | One if by Land, Two if by Sea, Three if by…Air?
Hi all, and welcome to the next installment of our 2026 Dev Corners. Your feedback on ideas in early development, including my prior ones on army quality and airborne troops, is very helpful to us. I …
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9/8Tue📢 AnnouncementHOI IV Dev Corner | Industrial Might & Military Production
Generals! Welcome to an additional Dev Corner on Military Production. Hello, I am Zwirbaum, Game Designer for Hearts of Iron, and welcome to this Dev Corner about Industry. This is a follow-up to the …
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9/1Tue📢 AnnouncementHOI IV Dev Corner | Inlay Windows & Congress
Hello there! Welcome to the next Dev Corner, where we might present something we’re working on or gauging people’s thoughts on mechanics and other things. Those of you who have been keeping up with ou…
August 2026
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8/25Tue📢 AnnouncementHOI IV Dev Corner | Romania, an Industry Divided
Hello all! In today's Dev Corner, we're diving into the economic crossroads of Romania. Like many nations in the 1930s, Romania was torn between its agrarian foundation and a push for rapid industrial…
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8/18Tue📢 AnnouncementHOI IV Dev Corner | Romanian Crossroads
Greetings, generals! We are Alex, Norrman and Marijn211, modders of the game and now cooperating with Paradox, and today we’re showing you tidbits of a future DLC for… Romania! As explained below we w…
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8/11Tue📢 AnnouncementHOI IV Dev Corner | Army Quality and Expertise
Hi everyone, Jamor here again. I want to thank you for good, informed feedback and suggestions in the previous airborne dev corner. I hope I can benefit from the community’s collective insight once mo…
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8/4Tue📢 AnnouncementHOI IV Dev Corner | National Focus Flavor
Hello all! Today we're kicking off a new round of Dev Corners, this time turning our attention to a project we haven't touched on yet. We'll start with some early questions around ideas we have in min…
Source: official Steam announcements (updated every 6–24 hours). Titles and summaries are copyright of the original developers.