Games Workshop has revealed the initial road map for Warhammer 40k codex army books for 10th edition Warhammer 40k, but there are still many armies waiting for new rules. This guide tracks all the codex release dates revealed so far, and everything we know about them.
This is a vital resource for existing 40k fans waiting for news on their favorite Warhammer 40k factions, but if you’re new to Games Workshop’s premier sci-fi miniature wargame, have no fear – our expert guides can help. What is Warhammer 40k is a good place to start, and we’ve got a rundown of the best Warhammer 40k starter set for your needs, too. You’ll find lots more at our Warhammer 40k homepage.
For now, though, let’s run through the latest official codex rulebooks – some already released, some scheduled, and others as yet mired in mystery. You can click the links below to find the info you need:
- What are Warhammer 40k codexes?
- Confirmed 10th edition codex release dates
- Which 10th edition codexes are coming next?
- How do I redeem Warhammer 40k codex codes?
What are Warhammer 40k codex books?
Codexes are the traditional home for the rules for each Warhammer 40k faction, though Warhammer 40k 10th edition launched with a full set of free ‘Index’ rules for each army.
As Codexes are released, they supercede the Index, updating rules and points, and adding new Warhammer 40k detachments that give you alternative ways to build your army that will reward you with new abilities, enhancements, and 40k Stratagems.
Confirmed 10th edition codex release dates
Of the at least 22 10th edition codexes we expect to arrive over the next two and a half years, only five have yet been released. Here’s a table showing all the codexes announced so far:
| Codex | Release date |
| Tyranids | September 9 2023 |
| Space Marines | October 7 2023 |
| Necrons | December 9 2023 |
| Adeptus Mechanicus | December 9 2023 |
| Dark Angels | March 9 2024 |
| T’au Empire | (Early access inside Kroot battleforce, March 23 2024) |
| Orks | April 20 2024 |
| Adeptus Custodes | April 20 2024 |
Codex Space Marines and Codex Tyranids came out in Fall 2023, with Codex Tyranids coming first. Codex Necrons and Codex Adeptus Mechanicus followed during Winter 2023.
Codex Supplement Dark Angels first arrived as part of the Deathwing Assault boxset that dropped on February 3, 2024. The standalone codex copies went to pre-order on February 24, and hit shelves on March 9.
If you’re wondering when a particular Codex released during 9th edition 40k, check out our guide to 9th edition Codexes.
Which 10th edition codexes are coming next?
Games Workshop has confirmed the next upcoming Warhammer 40k codexes to release will be the Tau Empire, Adeptus Custodes, and Orks – with pre-orders starting on April 13 2024.
Beyond them, we’ve many more 10th edition codexes still to come. Wargamer will be keeping our auspexes trained on GW for any hint of a renewed 10th edition codex roadmap. In the meantime, here’s a list of all the armies still awaiting new rules:
| Codex | Release date |
| Sisters of Battle (Adepta Sororitas) | Unknown |
| Astra Militarum | Unknown |
| Grey Knights | Unknown |
| Imperial Knights | Unknown |
| Chaos Space Marines | Unknown |
| Death Guard | Unknown |
| World Eaters | Unknown |
| Thousand Sons | Unknown |
| Chaos Daemons | Unknown |
| Chaos Knights | Unknown |
| Aeldari | Unknown |
| Drukhari | Unknown |
| Genestealer Cults | Unknown |
| Leagues of Votann | Unknown |
How do I redeem Warhammer 40k Codex codes?
You’ll find a unique Warhammer 40k Codex code in the back of each printed Codex. You can register this code on your MyWarhammer account, which will in turn unlock all the datasheets and Detachments from the Codex in the Warhammer 40k app.
You can then use that data in the Battle Forge army builder. You will be limited to just one army list at a time in the app, unless you also have a Warhammer+ subscription.