diff --git a/_includes/footer.html b/_includes/footer.html
index d9a4f7a..ebf7347 100644
--- a/_includes/footer.html
+++ b/_includes/footer.html
@@ -5,9 +5,16 @@
   <span class="footer_item">&copy; {{ site.time | date: "%Y" }}</span>
   <small class="footer_theme-copyright">
     <!-- Klisé Theme: https://github.com/piharpi/jekyll-klise -->
-    <a href="https://github.com/piharpi/jekyll-klise" target="_blank">klisé</a>
+    <a
+      href="https://github.com/piharpi/jekyll-klise"
+      target="_blank"
+      rel="noreferrer noopener"
+      >klisé</a
+    >
     theme on
-    <a href="https://jekyllrb.com" target="_blank">jekyll</a>
+    <a href="https://jekyllrb.com" target="_blank" rel="noreferrer noopener"
+      >jekyll</a
+    >
   </small>
 </footer>
 <script src="/assets/js/main.js" defer="defer"></script>