Hearts of Iron IV update 1.19.3 is currently targeting September 17, 2026. The official post published on Steam on September 4 warns that the date may still change. The game page on JEU.VIDEO provides additional information about the game.
The update should conclude the post-launch work related to Thunder at our Gates. Full HOI4 patch notes have not yet been published, but the studio has confirmed several areas of new content, bug fixes and balance adjustments.
Australia, Siam and Indonesia receive new content
Version 1.19.3 will add a new secret path for Australia, as well as endgame content for Siam and Indonesia. The studio has not yet detailed the affected national focus trees, missions or mechanics, so the precise scope of these additions is still unknown.
The patch will also include numerous bug fixes and balance changes. Some adjustments tested during the summer Open Beta are expected to carry over, but there is no exhaustive list showing which changes were retained. Players planning campaigns around Australia, Siam or Indonesia will need the final notes to assess the practical impact on their games.
September 17 remains a target date
September 17, 2026 is the only date currently communicated for HOI4 1.19.3. The update has not been announced as available, and its schedule remains subject to change. That uncertainty matters for ongoing campaigns and multiplayer sessions planned around the patch.
The additions for Australia, Siam and Indonesia are confirmed in principle. Their effect on balance and campaign progression cannot be judged until the detailed notes are published and the update is released.
The next major expansion is delayed
The studio has delayed its next major expansion to allow more development time. No new schedule, price, region or platform has been announced, so the official Hearts of Iron IV page on Steam is not an availability announcement.
A quality-of-life update is also in development to reduce clicking and mental load during games. It is expected to launch before the next Expansion Pass, but its release date and scope are still unknown. In practical terms, the expansion will arrive later while an ergonomic update is expected to come first.
Multiplayer problems remain under investigation
The studio is continuing to investigate hacking and griefing issues affecting part of the multiplayer community. No complete resolution or specific measure has been guaranteed at this stage.
HOI4 1.19.3 therefore remains a planned September 17 update, bringing new content for 3 countries alongside bug fixes and balance adjustments. Players should treat the date as provisional and wait for the complete notes before changing campaign or multiplayer plans around the patch.
