diff --git a/core/modules/ckeditor5/ckeditor5.module b/core/modules/ckeditor5/ckeditor5.module
index 561795fa95..bb4a9abdc3 100644
--- a/core/modules/ckeditor5/ckeditor5.module
+++ b/core/modules/ckeditor5/ckeditor5.module
@@ -428,8 +428,6 @@ function ckeditor5_library_info_alter(&$libraries, $extension) {
   }

   if ($extension === 'core') {
-    // CSS rule to resolve the conflict with z-index between CKEditor 5 and jQuery UI.
-    $libraries['drupal.dialog']['css']['component']['modules/ckeditor5/css/ckeditor5.dialog.fix.css'] = [];
     // Fix the CKEditor 5 focus management in dialogs. Modify the library
     // declaration to ensure this file is always loaded after
     // drupal.dialog.jquery-ui.js.
diff --git a/core/modules/ckeditor5/css/ckeditor5.dialog.fix.css b/core/modules/ckeditor5/css/ckeditor5.dialog.fix.css
deleted file mode 100644
index da2837934a..0000000000
--- a/core/modules/ckeditor5/css/ckeditor5.dialog.fix.css
+++ /dev/null
@@ -1,3 +0,0 @@
-.ui-dialog ~ .ck-body-wrapper {
-  --ck-z-panel: 1261;
-}
diff --git a/core/modules/ckeditor5/css/editor.css b/core/modules/ckeditor5/css/editor.css
index bbc9a31b50..481c073d04 100644
--- a/core/modules/ckeditor5/css/editor.css
+++ b/core/modules/ckeditor5/css/editor.css
@@ -9,6 +9,14 @@
   fill-opacity: 1 !important;
 }

+/**
+ * Adjust default z-index of "balloon" popups (such as the hyperlink dialog)
+ * to ensure it appears over jQuery UI modals.
+ */
+.ck-body-wrapper {
+  --ck-z-panel: calc(var(--jui-dialog-z-index) + 999);
+}
+
 .ck-editor__main > :is(.ck-editor__editable, .ck-source-editing-area) {
   /* Set the min-height equal to configuration value for the number of rows.
    * The `--ck-min-height` value is set on the parent `.ck-editor` element by