diff --git a/build.gradle.kts b/build.gradle.kts
index c7b282c..8e39beb 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,7 +12,7 @@ group = "de.hoennig"
 // bump at least the patch version for every deployment — and only then, not per commit —
 // so the UI footer (BuildProperties), --version and the release notes identify what is
 // actually running; a deployment bundles whatever was committed since the last one
-version = "0.9.14"
+version = "0.9.15"
 
 java {
     toolchain {
diff --git a/src/main/resources/templates/releases.html b/src/main/resources/templates/releases.html
index 70e9d23..82810f2 100644
--- a/src/main/resources/templates/releases.html
+++ b/src/main/resources/templates/releases.html
@@ -7,6 +7,15 @@
     <div th:replace="~{fragments :: nav(${view})}"></div>
     <div class="panel release-notes">
 
+        <h2>v0.9.15 <span class="muted">— 2026-08-28</span></h2>
+        <ul>
+            <li><strong>Changed:</strong> the build concurrency limit moved from
+                <code>builds.maxConcurrent</code> to <code>executor.maxConcurrent</code> (default 1,
+                no compatibility alias) — the <code>builds</code> section now holds build definitions
+                only. A leftover <code>builds.maxConcurrent</code> key is rejected as an invalid
+                build definition.</li>
+        </ul>
+
         <h2>v0.9.14 <span class="muted">— 2026-08-28</span></h2>
         <ul>
             <li>Named build definitions (ADR 0007): the <code>builds</code> section of