# Hearts of Iron IV HOI IV - Open Beta Update V

- Product: Hearts of Iron IV (https://whatsnew.fyi/product/hearts-of-iron-iv)
- Vendor: Paradox Development Studio
- Date: 2026-05-13
- Original notes: https://store.steampowered.com/news/app/394360/view/698764742929416233
- Permalink: https://whatsnew.fyi/product/hearts-of-iron-iv/releases/2026-05-13-hoi-iv-open-beta-update-v

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Made lend lease default to max amount for 'once' and to 100% for 'percentage' modes
- **changed** — Updated supply tooltip to show more carefully where all supply is coming from
- **fixed** — Fixed performance in very large scale naval battles with 1000+ ships
- **fixed** — Fixed a dx11 rendering bug
- **fixed** — Fixed a bug where England could not build improved battleships
- **changed** — Extensive rework of italian naval equipment
- **changed** — The AI will now train their troops more often
- **changed** — Updated generic taskforces so they are a bit more sensible
- **changed** — The AI will try to train their ships a bit more opportunistic
- **changed** — The AI will be a bit more sensical with picking a homebase for its standby fleet
- **added** — Added logic to prevent the AI from assigning too many patrols to support naval invasion
- **changed** — AI objectives will respect blocked naval regions now and not consider them for naval mission assignment anymore
- **fixed** — Fixed a bug where ships were partially considered for supply need
- **fixed** — Fixed a bug where USA was unable to build 1940 CVs
- **fixed** — Fixed a bug where a strike force sometimes gets stuck on an invalid target and stops working
- **fixed** — Fixed a bug where wrong snow modifier values were shown and fixed a bug where the leader snow adjuster did not work as intended
- **changed** — Snow attack penalty is now shown on the move-arrow tooltip
- **removed** — Removed legacy plane techs from BBA-enabled starts for 36 minor nations
- **fixed** — RI Bolzano in the 1939 OOB now uses the correct ship_hull_cruiser_2 (Bolzano Class)
- **fixed** — Convoy raiders won't join or reinforce a combat unless there are enemy convoys to shoot at
- **fixed** — Fixed a crash related to carrier airplanes being deployed

**Generals**!

Before we head out on our 4-Day LOA we wanted to give you another OB update. Give it a try, leave us a lot of feedback here, and we'll be back soon to take it all in and make potential adjustments.

How to join this Open Beta:

This beta client is **Case Green v1.18.1.0.9197 (01c8)**

To install Open Beta client, follow the instruction below:

- Right-click the game in your library

- Select Properties from the drop-down menu

- Select Game Versions & Betas

- Select the beta branch called open_beta

If you are already on the Open Beta client, you should get an update automatically.

Finally, to report any issues you find, in relation to this beta, [please use the bug report forum](https://forum.paradoxplaza.com/forum/forums/hearts-of-iron-iv-bug-reports.951/) and make sure to include the version you’re using. That way our Jira won’t go nuts trying to figure out what bug report belongs to what.

**Open Beta Update V Notes **

**Gameplay**

- Made lend lease default to max amount for 'once' and to 100% for 'percentage' modes

- Updated supply tooltip to show more careful where all supply is coming from

**Stability & Performance**

- Fixed performance in very large scale naval battles (1000+ ships)

- Fixed a dx11 rendering bug

**AI**

- Fixed a bug where England could not build improved battleships

- Extensive rework of italian naval equipment

- The AI will now train their troops more often

- Updated generic taskforces so they are a bit more sensible

- The AI will try to train their ships a bit more opportunistic

- The AI will be a bit more sensical with picking a homebase for its standby fleet

- Added logic to prevent the AI from assigning too many patrols to support naval invasion

**Modding**

- AI objectives will respect blocked naval regions now and not consider them for naval mission assignment anymore

**Bugfixes**

- Fixed a bug where ships were partially considered for supply need

- Fixed a bug where USA was unable to build 1940 CVs

- Fixed a bug where a strike force sometimes gets stuck on an invalid target and stops working

- Fixed a bug where wrong snow modifier values were shown + fixed a bug where the leader snow adjuster didnt work as intended

- Snow attack penalty is now shown on the move-arrow tooltip

- Removed legacy plane techs from BBA-enabled starts for 36 minor nations

- RI Bolzano in the 1939 OOB now uses the correct ship_hull_cruiser_2 (Bolzano Class)

- Convoy raiders won't join or reinforce a combat unless there are enemy convoy's to shoot at

- Fixed a crash related to carrier airplanes being deployed

As you were!

_(And try to leave this place in one piece while we're out!)_