diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index 4af774e..8f3f1b9 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -67,7 +67,7 @@
                 _initInProgress = false;
                 console.warn("[SonicSF] AudioWorklet failed, trying WorkerSynthesizer:", e);
                 try {
-                    const mod = await import("https://esm.sh/spessasynth_lib@4.3.1");
+                    const mod = await import("https://cdn.jsdelivr.net/npm/spessasynth_lib@4.3.1/dist/index.js");
                     _synthInstance = new mod.WorkerSynthesizer(audioContext);
                     await _synthInstance.isReady;
                     _initialized = true;
diff --git a/app/templates/index.html b/app/templates/index.html
index 5bbd52f..e36b58d 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -10,11 +10,18 @@
     <script src="https://unpkg.com/lucide@latest"></script>
     <script src="https://unpkg.com/react@18.3.1/umd/react.production.min.js"></script>
     <script src="https://unpkg.com/react-dom@18.3.1/umd/react-dom.production.min.js"></script>
+    <script type="importmap">
+      {
+        "imports": {
+          "spessasynth_core": "https://cdn.jsdelivr.net/npm/spessasynth_core@latest/dist/spessasynth_core.mjs"
+        }
+      }
+    </script>
     <script type="module">
-      import { WorkletSynthesizer } from 'https://esm.sh/spessasynth_lib@4.3.1';
+      import { WorkletSynthesizer } from 'https://cdn.jsdelivr.net/npm/spessasynth_lib@4.3.1/dist/index.js';
       window.SpessaSynthClass = WorkletSynthesizer;
-      window.__SpessaSynthCDN = '/static/js/services/';
-      console.log('[SonicSF] SpessaSynth library loaded via esm.sh.');
+      window.__SpessaSynthCDN = 'https://cdn.jsdelivr.net/npm/spessasynth_lib@4.3.1/dist/';
+      console.log('[SonicSF] SpessaSynth library loaded from CDN.');
     </script>
     <script src="/static/js/services/api.js?v=202607232105"></script>
     <script src="/static/js/services/audioEngine.js?v=202607232105"></script>