V3.0 Mod Compatibility - What Breaks in Dead Hot Summer (And What To Do)

Updated June 16, 2026 from the official release notes. V3.0 experimental is live now (since June 15) - opt in via the Steam beta branch latest_experimental; the mod-update wave is underway, and Steam and console stable are targeted ~June 29.

Every major 7DTD update breaks mods; V3.0 breaks them in documented, specific ways, because The Fun Pimps shipped real modding-infrastructure changes alongside the sandbox update. If you run a modded server or maintain a mod, here is exactly what the release notes say changes, what it means, and the safe sequence for update week.

Wondering whether your specific overhaul will even get a V3.0 build? Check the 2026 Mod Status Tracker - it lists which mods are actively maintained (and tend to update fast) versus stagnant or pinned to older versions.

The documented breaking changes

  • Localization.txt → Localization.csv. Renamed to match its actual contents. Mods shipping localization files need the rename; tooling that targets the old filename stops finding it.
  • entitygroups.xml returns to proper XML elements. The previous text-based format is still supported "currently" - which is modder-speak for migrate now, the compatibility shim will not live forever.
  • Code mods: one assembly, publicized. You now reference only the game's core Assembly-CSharp.dll, and because the code passes through a publicizer, code that overrides vanilla methods may need those overrides made public. Most C# mods need at least a recompile.
  • XUi framework overhaul (the big one for UI mods). A new XML binding system moves control from code to XML; new views (video, scrollbar, scrollview); controls.xml renamed to templates.xml; the folder renamed to XUi_InGame; the force_hide attribute removed in favor of visible; tweens controllable from XML. UI-heavy mods (HUDs, bigger backpacks with custom windows, quest trackers) face real porting work, not a recompile.

What this means for modded servers

  • Assume nothing survives update day. The XUi rework alone touches most popular server-side UI conveniences. The usual wave applies: big mods within days, mid-size within weeks, abandoned never.
  • Overhauls will lag longest. Darkness Falls-class total conversions touch entitygroups, localization, code, and UI at once - every changed surface. Overhaul servers should plan to stay on V2.6 until their overhaul publishes a V3.0 build (saves do not load backward, so the move is one-way).
  • Some mods become obsolete - in a good way. A real fraction of the server-mod ecosystem exists to do what the 150 sandbox options now do natively (loot abundance, zombie speeds, headshot rules, death penalties). Before porting a settings mod, check whether V3.0 just shipped it as a checkbox.
  • The safe sequence: export your mod list → classify critical / nice-to-have / replaced-by-sandbox-options → wait for critical mods' V3.0 releases → test on a copy → then move the community save. Our SandboxCode guide covers the config side of the same migration.

For mod authors: the priority order

  • Week one: rename localization, recompile against the publicized assembly, fix any override visibility errors - that revives non-UI mods fastest.
  • Week two: entitygroups to proper XML (do not lean on the deprecated text format).
  • The long tail: XUi ports. The new binding system is documented on the official wiki, and the consolidation (shared attributes across views, rects over panels) genuinely reduces duplication once ported - the pain is front-loaded.

Timing

Experimental is live now (since June 15; opt in via latest_experimental); Steam and console stable are targeted ~June 29. Mod authors can port against experimental today, which historically means the big mods are ready near stable day. Track overall V3.0 status on the live tracker.

Sources