diff --git a/CHANGELOG.md b/CHANGELOG.md
index c350dae..1b6f78d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
## [Unreleased]
### Changed
+- **Audiobook parser compatibility boundary.** Speech-heuristic constants consumed by the scoped Audiobook core are now
+ exported explicitly, preventing load-order regressions while preserving the parser namespace.
+- **Audiobook core namespace migration.** Reader-side audiobook state, attribution helpers, quote controls, and Rehearser
+ handoff now use a private scope with explicit compatibility exports and a regression-tested core namespace.
- **Rehearser core namespace migration.** Script state, pagination, cast-management, and summary APIs now live inside a
private core scope with explicit legacy exports and a regression-tested `window.TTVC.rehearser.core` surface.
- **Rehearser recording namespace migration.** Microphone overlay, recording controls, and shared microphone errors now
diff --git a/VERSION b/VERSION
index 90c2a29..e17883e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.24.62
+1.24.64
diff --git a/static/index.html b/static/index.html
index 123fed1..9cec7f6 100644
--- a/static/index.html
+++ b/static/index.html
@@ -10,7 +10,7 @@
-
+
@@ -27,12 +27,12 @@
-
-
-
-
-
-
+
+
+
+
+
+
@@ -397,7 +397,7 @@ window.toggleNavTree = function(treeId, chevronId) {
-
+