A new Hearts of Iron IV update patch notes are released for players. Since the last major update, players have been experiencing multiple issues and bugs Hopefully, today’s Hearts of Iron IV update will address some of these issues and bugs.
Read what is new and fixed in today’s Hearts of Iron IV patch. Read the official patch notes below.
Hearts of Iron IV Patch Notes- March 4, 2025
Graveyard of empires
- Added focus tree for Iran
- Added focus tree for Iraq
- Added focus tree for Afghanistan
- Expanded focus tree for the British Raj
- Added numerous 3D models for Iran, Iraq, Afghanistan and the Raj
- Added 8 new music tracks
- Added Voiceovers for Iran, Iraq, Afghanistan and the Raj
Gameplay
- British Burma now exists from game start as a British subject
- Mandatory Palestine now exists from game start as a British subject
- Jordan now exists from game start as a British subject
- Kuwait now exists from game start as a British subject
- Lebanon now exists from game start as a French subject
- Syria now exists from game start as a French subject
- Added new tactics and modifiers for city combat
- Added Burma namelist and oob
- Removed Prince Henry as leader for Palestine
Balance
- Siam now joins the Co-Prosperity sphere on historical
- Added a port in Phuket
- Added a supply hub in Hat Yai
- Siam starts with army of Siam spirit
- Extra shared slots don’t get removed when flipping state owners anymore
- Added railway line to Archangelsk
- Added some resources in Pakistan area (Peshawar 3 Steel, Baluchistan States 3 Oil)
- Updated Siams AI to produce more units and streamline production
- Increased Siams building slots
UI
- Reliability and Torpedo upgrades no longer overlap for Torpedo Cruisers
Modding
- has_artillery_ratio, has_cavalry_ratio and has_unit_type triggers now also consider support units
Bugfixes
- Fixed a Crash To Desktop (CTD) when loading games with prepared raids
- Daily Army, Air and Naval XP gain can no longer be negative
- Prevent a rare Out Of Sync (OOS) related to operative mission names when using different languages
- Swedish national spirit “Hungersköld” is no longer removed too early
- The Netherlands can once again Placate the Germans through their Gateway of Europe Decision
- Without Götterdammerung, there can be only one Fascist Advisor in Belgium
- Fixed an issue where Germany’s Operation Panzerfaust would result in Hungary getting puppeted and having their war reset, resulting in teleported divisions
- Dutch East Indies no longer starts with only 10% democratic support
- “Expansion Pass 1: Supporter Pack” is no longer included in save game compatibility checks
- Fixed a rare random OOS in AI truck production
- Fixed rare Out of Sync in character name generation
- Fixed UI Crash when reordering items in lists
Performance
- AI is now more performant when upgrading equipment
- Weather updates are now more efficiently parallelized
- AI plans naval invasion in parallel (drastically reduced spikes on multi-core CPUs)
- Refactored a number of decision systems to improve performance
- Optimized AI diplomacy calculations
- Optimized how reinforcements are computed
- AI is now more performant when selecting which doctrines to upgrade
- MIO attributes are now computed faster across the board
- Naval supremacy is now better parallelized
Download Hearts of Iron IV update on PC.