Paradox Interactive has released the next big update for Hearts of Iron IV.

The 1.7 Hydra update introduces 64-bit support, lots of new music as part of the HOI Classics radio station, improved AI, naval combat rebalances, and more. You can find the full patch notes here.

This free update is accompanied by two small DLC packs. The Radio Pack adds three faction-themed radio stations, totaling up to 35 new pieces of music. The Axis Armor Pack adds 53 new vehicle models divided among Germany, Italy, and Japan. You can check out a trailer above. The Radio Pack is $6.99, while the Axis Armor Pack is $5.99.

Here’s a rundown of the new DLCs:

Drown out the hum of machinery and whine of bomber engines with the soothing sounds of new martial music brought to you by Paradox Interactive and its composing partners. This DLC pack adds unique radio stations for each of the three major factions in Hearts of Iron IV (Allies, Axis and Comintern).

The Hearts of Iron Radio Pack gives access to:

Faction Radio Channels:

A total of 35 new songs spread across three faction specific radio channels, each with their own unique look and design.

Push through the plains of the Low Countries or the jungles of Burma in style with new 3D unit models of Axis armor units. A total of 53 new armor models are in this pack which, added to the eight tanks available in the German Tank Pack, gives the forces of fascist militarism 61 different armor designs you can see in-game.

As a free bonus – the Axis Armor Pack also includes eight German tank models, previously only available in the Hearts of Iron IV: Colonel edition, such as the King Tiger and the Maus super heavy tank. After all, you can’t have Axis Armor without German tanks.

The Axis Armor Pack includes:

• 19 German Armor Models: A range of tank destroyers, self propelled artillery and self propelled anti-air vehicles, including the Stug III, the Wespe and the Elefant heavy tank destroyer.
• 22 Japanese Armor Models: A range of every armor type, with seven different Japanese tank designs like the experimental heavy O-I tank that never went into production and a number of tank destroyers.
• 12 Italian Armor Models: A roster of Semovente tank destroyers and the always outmatched L6 tank highlight this list of Italian armor from the war.

Hearts of Iron IV is available on Windows PC, Mac, and Linux via Steam for $39.99, and its currently 60% off.