diff --git a/CHANGELOG.md b/CHANGELOG.md
index 813bd10..54efa2b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ All notable changes to StatPanel are recorded here.
 This project follows [Semantic Versioning](https://semver.org/) and the format
 of [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [Unreleased]
+
+### Changed
+
+- **Interface version bumped to `120100` for patch 12.1.0.** No code changes
+  were needed; this is the flag that stops the client and the listing sites
+  marking the addon out of date.
+
 ## [2.5.0] - 2026-08-06
 
 ### Fixed
diff --git a/README.md b/README.md
index 838ca4b..248d481 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # StatPanel
 
 ![License](https://img.shields.io/badge/license-MIT-blue.svg)
-![Interface](https://img.shields.io/badge/WoW-12.0%20Midnight-orange.svg)
+![Interface](https://img.shields.io/badge/WoW-12.1%20Midnight-orange.svg)
 ![Lua](https://img.shields.io/badge/Lua-5.1-000080.svg)
 
 A movable panel for World of Warcraft showing your secondary stats in your
diff --git a/StatPanel.toc b/StatPanel.toc
index d56c778..157ade9 100644
--- a/StatPanel.toc
+++ b/StatPanel.toc
@@ -1,4 +1,4 @@
-## Interface: 120007
+## Interface: 120100
 ## Title: StatPanel
 ## Notes: Fully customizable secondary stat, speed and FPS display
 ## Author: Fennell
diff --git a/tests/wow_stub.lua b/tests/wow_stub.lua
index 22d33c1..54a498e 100644
--- a/tests/wow_stub.lua
+++ b/tests/wow_stub.lua
@@ -212,7 +212,7 @@ function M.install(env)
     -- Character and stats
     ----------------------------------------------------------------------------
     def("GetLocale", function() return "enUS" end)
-    def("GetBuildInfo", function() return "12.0.7", "62000", "Jul 27 2026", 120007 end)
+    def("GetBuildInfo", function() return "12.1.0", "62000", "Jul 27 2026", 120100 end)
     def("UnitName", function() return "Teststrider" end)
     def("GetRealmName", function() return "Test Realm" end)
     def("UnitClass", function() return "Hunter", "HUNTER", 3 end)