diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7539d09..f807d34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 
 ---
 
+## [1.20.46] — 2026-08-19
+
+### Fixed
+- **Completed synthesized voice previews now release their Blob URLs.** Repeated preview playback no longer retains every generated clip in browser memory.
+
 ## [1.20.45] — 2026-08-19
 
 ### Fixed
diff --git a/VERSION b/VERSION
index b741e05..0ef939e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.20.45
+1.20.46
diff --git a/static/index.html b/static/index.html
index 35a07b2..e9b5922 100644
--- a/static/index.html
+++ b/static/index.html
@@ -10,7 +10,7 @@
   <meta name="format-detection" content="telephone=no">
   <meta name="color-scheme" content="light dark">
   <meta name="theme-color" content="#2563EB">
-  <meta name="app-version" content="1.20.45">
+  <meta name="app-version" content="1.20.46">
   <link rel="manifest" href="/manifest.webmanifest">
   <link rel="icon" href="/static/icon.svg" type="image/svg+xml">
   <link rel="apple-touch-icon" href="/static/icon.svg">
@@ -27,7 +27,7 @@
 
   <!-- ── Core styles (local — no CDN dependency for first paint) ────────── -->
   <link rel="stylesheet" href="/static/vendor/mdi/materialdesignicons.min.css">
-  <link rel="stylesheet" href="/static/style.css?v=1.20.45">
+  <link rel="stylesheet" href="/static/style.css?v=1.20.46">
 
 
   <!-- ── Flag icons — non-blocking (loaded async, icons appear after JS) ── -->
@@ -378,7 +378,7 @@ window.toggleNavTree = function(treeId, chevronId) {
 </script>
 
 <!-- loader.js: fetches sections → loads JS modules → removes skeleton -->
-<script src="/static/loader.js?v=1.20.45"></script>
+<script src="/static/loader.js?v=1.20.46"></script>
 
 </body>
 </html>
diff --git a/static/js/voice-library.js b/static/js/voice-library.js
index f40ee85..73aee43 100644
--- a/static/js/voice-library.js
+++ b/static/js/voice-library.js
@@ -3252,7 +3252,17 @@ function makeVoiceRow(v) {
         $('lib-audio-label').textContent = v.id + ' · original recording';
       }
       bar.style.display = '';
-      audio.onended = () => { setLibraryPlayButtonState(playBtn, 'idle'); _activePlayVoiceId = null; };
+      audio.onended = () => {
+        setLibraryPlayButtonState(playBtn, 'idle');
+        _activePlayVoiceId = null;
+        // A synthesized preview is only needed while it is playing or
+        // paused for resume. Once it has ended, release the Blob URL so a
+        // sequence of previews cannot retain every generated clip in RAM.
+        if (_activePlayUrl) {
+          URL.revokeObjectURL(_activePlayUrl);
+          _activePlayUrl = null;
+        }
+      };
       audio.onpause = () => { if (_activePlayButton === playBtn) setLibraryPlayButtonState(playBtn, 'idle'); };
       audio.onplay = () => { setLibraryPlayButtonState(playBtn, 'playing'); };
       await audio.play();