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Hearts of Iron IV

Hearts of Iron IV

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🛠️ 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.

Latest update · Sep 17
🛠️ HOI IV | Patch 1.19.3 Version 1.19.3
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October 2026

  • 10/7Wed
    📢 Announcement
    Dev 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. …

  • 10/6Tue
    📢 Announcement
    HOI 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…

  • 10/2Fri
    🎉 Events
    Steam Autumn Sale 2026

    Generals!We've received communications from our Allied Headquarters, that indicates Hearts of Iron IV and its associated DLCs will be taking part with the Steam Autumn Sale!Take advantage of this rece…

  • 10/1Thu
    📢 Announcement
    HOI 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

  • 9/29Tue
    📢 Announcement
    HOI 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…

  • 9/22Tue
    📢 Announcement
    HOI 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…

  • 9/17Thu
    🛠️ Patch / update v1.19.3
    HOI IV | Patch 1.19.3

    Generals! With the weather becoming more gloomy and the summer on its way out, we bring the last “Summer” release. This will be the last patch that specifically targets Thunder at our Gates and brings…

  • 9/15Tue
    📢 Announcement
    HOI 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 …

  • 9/8Tue
    📢 Announcement
    HOI 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 …

  • 9/4Fri
    🛠️ Patch / update
    Studio Gold Update | September 2026

    Hello Generals, Admirals and Air Chief Marshals! Swedish summer is over, and we were blessed as it lasted a good 5 weeks. We’d already started work on the 1.19.3 patch before, and we’ve been at work p…

  • 9/1Tue
    📢 Announcement
    HOI 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

  • 8/28Fri
    🛠️ Patch / update v3.03
    HOI IV | Open Beta SE™ Update 3.03

    Generals! Hello, I’m Zwirbaum, Game Designer for Hearts of Iron, and I want to welcome you to yet another Open Beta SE™ (Not really trademarked) Update for Hearts of Iron IV. This week I am bringing m…

  • 8/25Tue
    📢 Announcement
    HOI 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…

  • 8/18Tue
    📢 Announcement
    HOI 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…

  • 8/12Wed
    🛠️ Patch / update v2
    HOI IV | Open Beta SE™ Update 2

    Generals! Hello, I’m Pdxen, Tech Lead for Hearts of Iron and I want to welcome you to the second update of the Summer Open Beta. In this update we are changing the topic from balancing to updating the…

  • 8/11Tue
    📢 Announcement
    HOI 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…

  • 8/4Tue
    📢 Announcement
    HOI 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.