ATCHED
Hearts of Iron IV

Hearts of Iron IV

Paradox Development Studio / Paradox Interactive

Strategy

A World War II grand strategy game where players take command of any nation and manage military operations, production, and diplomacy.

// PATCH HISTORY

2/5 Minor6d ago

Peace For Our Time | Patch 1.18.1

Czechoslovakia receives three new focuses and Poland gains a new branch for Czech MIOs in this post-DLC stability update.

3/5 Moderate2w ago

Peace for Our Time | Patch Notes

Patch 1.18 'Peace for Our Time' introduces new Train and Helicopter MIOs for major powers, overhauls submarine detection, and significantly improves AI behavior for Germany, Italy, and the UK.

3/5 Moderate2w ago

HOI IV | Open Beta III

BETAMajor naval overhaul reducing fuel consumption for heavy ships and carriers while reworking engine stats and submarine visibility.

4/5 SignificantApr 2, 2026

HOI IV - Open Beta Update II

Submarines receive massive survivability buffs through detection formula reworks, while Carriers see base detection nerfed in favor of deck module specialization.

4/5 SignificantMar 27, 2026

HOI IV - Open Beta Update 01

Submarine detection formula reworked and minimum naval hit chance slashed from 2% to 0.5% to reduce torpedo lethality, alongside massive resource and manpower cost reductions for most ship hulls.

1/5 TrivialMar 26, 2026

Warships of the Pacific - Hotfix, 1.17.5.2

Hotfix 1.17.5.2 resolves Division Designer UI issues, including template update interference and missing tank model pools.

4/5 SignificantMar 20, 2026

HOI IV - Open Beta

Major naval overhaul reduces manpower requirements for most ships and shifts resource costs from modules to hulls.

1/5 TrivialMar 19, 2026

Warships of the Pacific - Hotfix, 1.17.5.1

Fixed nation-specific infantry 3D models displaying as generic and corrected M24 Chaffee model ordering for US Great War tanks.

4/5 SignificantMar 17, 2026

Warships of the Pacific Available NOW!

Warships of the Pacific introduces 30 new naval models and icons alongside a major UI overhaul for the equipment selector and significant balance buffs for France and the USA.

4/5 SignificantMar 16, 2026

Warships of the Pacific - Patch Notes, 1.17.5

Warships of the Pacific introduces new naval designs for the USA, UK, and Japan, alongside a major AI overhaul for Pacific theater strategy and faction influence rebalancing.

2/5 MinorFeb 26, 2026

Mod Update Warships of the Pacific

Hearts of Iron IV updates the 3D model selector for equipment and division designers, introducing breaking changes for modders' camera settings.

2/5 MinorFeb 25, 2026

(Very small) Hotfix - Patch 1.17.4.1

Research Bonuses no longer stack infinitely after a critical fix ensures they are properly consumed upon use.

3/5 ModerateFeb 19, 2026

No Compromise, No Surrender | Patch 1.17.4

Soviet Union receives major focus tree buffs and tech requirement reductions alongside a comprehensive overhaul of Naval AI and Air-to-Ground combat damage.

3/5 ModerateFeb 11, 2026

No Compromise, No Surrender - 1.17.4 Open Beta Client Update

Soviet mastery gain is significantly buffed while CAS damage is reduced to prevent it from being overpowered.

4/5 SignificantFeb 2, 2026

No Compromise, No Surrender - 1.17.4 Open Beta

Soviet Union land mastery and global organization gain nerfed alongside massive content expansions for Iraq, Turkey, and Chinese Warlords.

Quick Stats

Last update
6d ago
Platforms
pc, mac

Official Source

View official patch notes