diff --git a/js/tb-megamenu-chosen-fix.js b/js/tb-megamenu-chosen-fix.js
new file mode 100644
index 0000000..f8a4c7e
--- /dev/null
+++ b/js/tb-megamenu-chosen-fix.js
@@ -0,0 +1,27 @@
+/**
+ * @file
+ * Fixes compatibility issues between Chosen and jQuery in Drupal 11.
+ */
+
+(function ($, Drupal, drupalSettings) {
+  "use strict";
+
+  // Polyfill for jQuery.trim if it doesn't exist (jQuery 4.x removed it)
+  if (typeof $.trim !== 'function') {
+    $.trim = function(text) {
+      return text == null ? "" : (text + "").replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, "");
+    };
+  }
+
+  Drupal.behaviors.tbMegaMenuChosenFix = {
+    attach: function (context) {
+      // Apply chosen with a slight delay to ensure jQuery.trim polyfill is available
+      setTimeout(function() {
+        $("#tb-megamenu-admin select").chosen({
+          disable_search_threshold: 15,
+          allow_single_deselect: true
+        });
+      }, 100);
+    }
+  };
+})(jQuery, Drupal, drupalSettings);
diff --git a/js/tb-megamenu.backend.js b/js/tb-megamenu.backend.js
index 1234567..abcdefg 100644
--- a/js/tb-megamenu.backend.js
+++ b/js/tb-megamenu.backend.js
@@ -19,10 +19,7 @@ Drupal.TBMegaMenu = Drupal.TBMegaMenu || {};
         $(this).parent().html("");
       });
 
-      $("#tb-megamenu-admin select").chosen({
-        disable_search_threshold : 15,
-        allow_single_deselect: true
-      });
+      // Chosen initialization moved to tb-megamenu-chosen-fix.js
 
       /* Init TB Mega Menu. */
       if (drupalSettings.TBMegaMenu.menu_name !== undefined) {
diff --git a/tb_megamenu.libraries.yml b/tb_megamenu.libraries.yml
index 1234567..abcdefg 100644
--- a/tb_megamenu.libraries.yml
+++ b/tb_megamenu.libraries.yml
@@ -9,6 +9,7 @@ form.configure-megamenu:
   js:
     js/tb-megamenu.backend.js: { scope: footer }
     js/tb-megamenu.object.js: { scope: footer }
+    js/tb-megamenu-chosen-fix.js: { scope: footer }
   dependencies:
     - core/jquery
     - core/drupal
@@ -32,11 +33,11 @@ theme.tb_megamenu:
     - core/once
 
 form.chosen:
-  version: 1.1.0
+  version: 1.8.7
   css:
     theme:
-      https://cdnjs.cloudflare.com/ajax/libs/chosen/1.1.0/chosen.min.css: { type: external }
+      https://cdnjs.cloudflare.com/ajax/libs/chosen/1.8.7/chosen.min.css: { type: external }
   js:
-    https://cdnjs.cloudflare.com/ajax/libs/chosen/1.1.0/chosen.jquery.min.js: { type: external, group: JS_LIBRARY, scope: footer }
+    https://cdnjs.cloudflare.com/ajax/libs/chosen/1.8.7/chosen.jquery.min.js: { type: external, group: JS_LIBRARY, scope: footer }
   dependencies:
     - core/jquery