All Warhammer 40k Codex release dates in 2025

Which Warhammer 40k codex releases are coming in 2025? 22 armies have now received their 10th edition codex (or at least an index update) – with two more just about to drop, and more certain to come later We’re keeping this guide stocked with all the 10th edition codex release dates we know are coming in 2025 and beyond, and the latest new releases too. There’s also handy info on how to use your codexes, and links to our army guides.

If you’re new to Games Workshop’s premier sci-fi miniature wargame, our expert guides to the Warhammer 40k factions will help you get oriented in this huge sci-fi world – there’s more than just Space Marine chapters.

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:

Confirmed 10th edition codex release dates

Games Workshop has confirmed that the next two codexes to release will be Codex Supplement Black Templars, and Codex Grey Knights. These will be available to pre-order on July 26, which should mean they’re available on August 2.

Of the at least 24 10th edition codexes we expect to arrive over the (roughly) three years of the edition, 212factions now have either a codex or an updated index, and two more have release dates. This includes a re-release of Index Deathwatch – which was briefly deprecated by Codex Imperial Agents – and mid-edition refreshes of both Index Chaos Daemons and Index Imperial Knights.

Here’s a table showing all the codexes (and updates) released so far:

If you’re wondering when a particular codex released during 9th edition 40k, check out our guide to 9th edition codexes.

Here’s our run-down of the upcoming codexes we’re still expecting and their release date, or estimated release window:

The surprise release of Codex Imperial Agents in 2024, which collected the rules for Inquisitors, Rogue Traders, Imperial Assassins, and the Deathwatch, seems to bode well for further new (or resurrected) factions to be added to the tabletop game – we’ll keep praying to the Emperor of Mankind.

Games Workshop hasn’t revealed the 10th edition Codex Leagues of Votann release date.  GW revealed a substantial range of new Leagues of Votann miniatures during the Warhammer Summer preview on July 18, and confirmed that the new Leagues of Votann codex would be coming at the same time – but so far, there’s no indication of when that might be.

Then on June 18, Games Workshop published an updated Index Imperial Knights. The accompanying article on Warhammer Community stated that the delay in the Imperial Knights Codex is because “the noble households are still looking for the keys for their new Knight Defender” –  a new Knight model that GW revealed at the start of May.

This may just be a bit of tongue in cheek humour. But it’s also possible that there have been production delays for the Defender kit, and GW doesn’t want to release the Codex until the flagship new model is in stock.

Games Workshop released a free, updated Chaos Daemons 10th edition index on March 12, 2025 – you can download the free PDF Index here. Though it dashes fans’ hopes for a standalone codex this edition, we’re encouraged by the decision – the more free rules in the game, the better.

There are a raft of small changes in the rules, with GW highlighting a few themed buffs for the different gods:

• “Bloodthirsters, Skarbrand and Bloodcrushers all get a 3+ Armour Save”
• “Daemonettes and Tranceweavers now have Fights First all the time”
• “Great Unclean Ones now increase the Toughness of nearby Nurgle units”

On the whole, it means that Chaos Daemons remain a fully supported standalone army – but not likely a mainstream choice. Your Plaguebearers, Nurglings, Bloodletters, Horrors, Flamers, and other gribbly nasties are more likely to see play as allies to their favorite Chaos Space Marines, using their rules in the Emperor’s Children codex and the similar sections we expect in the upcoming Death Guard, World Eaters, and Thousand Sons ‘dexes.

This arrangement, with daemons and mortal followers of a specific god in one army list, is similar to how chaos forces are organised in Warhammer Age of Sigmar armies – and Age of Sigmar does not have a standalone battletome for Chaos Daemons as a whole.

Each PDF adds a full Warhammer 40k detachment, complete with detachment rule, four Enhancements, and six Stratagems, to offer a new way to play each faction. These detachments are available to use in games alongside the ones provided in your faction’s codex (or Index, if you don’t have one yet).

You can download the detachment PDFs below:

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.

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.

We also have a rundown of the best Warhammer 40k starter set for your needs, too. You’ll find lots more at our Warhammer 40k homepage.