diff --git a/frontend/app.js b/frontend/app.js
index 0e6bb7a..849b33f 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -734,8 +734,9 @@ function noteApp() {
             const notePath = this.draggedNoteForLink;
             const noteName = notePath.split('/').pop().replace('.md', '');
             
-            // Create markdown link
-            const link = `[${noteName}](${notePath})`;
+            // Create markdown link (URL-encode the path to handle spaces and special characters)
+            const encodedPath = notePath.split('/').map(segment => encodeURIComponent(segment)).join('/');
+            const link = `[${noteName}](${encodedPath})`;
             
             // Insert at cursor position
             const textarea = event.target;
@@ -775,7 +776,8 @@ function noteApp() {
             event.preventDefault();
             
             // Remove any anchor from the href (e.g., "note.md#section" -> "note.md")
-            const notePath = href.split('#')[0];
+            // Also decode URL encoding (e.g., "note%203.md" -> "note 3.md")
+            const notePath = decodeURIComponent(href.split('#')[0]);
             
             // Skip if it's just an anchor link
             if (!notePath) return;
@@ -2424,11 +2426,11 @@ function noteApp() {
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>${noteName}</title>
     
-    <!-- Highlight.js for code syntax highlighting -->
+    <!-- Highlight.js for code syntax highlighting (v11.9.0) -->
     ${highlightTheme ? `<link rel="stylesheet" href="${highlightTheme}">` : '<!-- No highlight.js theme detected -->'}
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
     
-    <!-- MathJax for LaTeX math rendering (same config as preview) -->
+    <!-- MathJax for LaTeX math rendering (v3.2.2) -->
     <script>
         MathJax = {
             tex: {
@@ -2452,11 +2454,11 @@ function noteApp() {
             }
         };
     </script>
-    <script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/mathjax@3.2.2/es5/tex-mml-chtml.js"></script>
     
-    <!-- Mermaid.js for diagrams (if used in note) -->
+    <!-- Mermaid.js for diagrams (v10.9.0) -->
     <script type="module">
-        import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
+        import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10.9.0/dist/mermaid.esm.min.mjs';
         const isDark = ${this.getThemeType() === 'dark'};
         mermaid.initialize({ 
             startOnLoad: false,
diff --git a/frontend/index.html b/frontend/index.html
index f01b5b9..f52dce6 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -11,14 +11,14 @@
     <link rel="icon" type="image/png" sizes="16x16" href="/static/favicon.svg">
     <link rel="apple-touch-icon" href="/static/logo.svg">
     
-    <!-- Tailwind CSS from CDN -->
-    <script src="https://cdn.tailwindcss.com"></script>
+    <!-- Tailwind CSS from CDN (v3.4.17) -->
+    <script src="https://cdn.tailwindcss.com/3.4.17"></script>
     
-    <!-- Alpine.js -->
-    <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script>
+    <!-- Alpine.js (v3.14.1) -->
+    <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.14.1/dist/cdn.min.js"></script>
     
-    <!-- Marked.js for Markdown parsing -->
-    <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
+    <!-- Marked.js for Markdown parsing (v12.0.2) -->
+    <script src="https://cdn.jsdelivr.net/npm/marked@12.0.2/marked.min.js"></script>
     
     <!-- MathJax for LaTeX math rendering -->
     <script>
@@ -39,9 +39,9 @@
             }
         };
     </script>
-    <script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/mathjax@3.2.2/es5/tex-mml-chtml.js"></script>
     
-    <!-- Highlight.js for code syntax highlighting -->
+    <!-- Highlight.js for code syntax highlighting (v11.9.0) -->
     <link rel="stylesheet" id="highlight-theme" href="">
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/csharp.min.js"></script>
@@ -57,9 +57,9 @@
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/css.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/languages/http.min.js"></script>
     
-    <!-- Mermaid.js for diagram rendering -->
+    <!-- Mermaid.js for diagram rendering (v10.9.0) -->
     <script type="module">
-        import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs';
+        import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@10.9.0/dist/mermaid.esm.min.mjs';
         // Note: Mermaid is initialized dynamically by app.js renderMermaid() based on current theme
         window.mermaid = mermaid;
     </script>