diff --git a/docs/upgrade-guides/2-20-0-to-2-21-0.md b/docs/upgrade-guides/2-20-0-to-2-21-0.md
new file mode 100644
index 0000000..56cb696
--- /dev/null
+++ b/docs/upgrade-guides/2-20-0-to-2-21-0.md
@@ -0,0 +1,4 @@
+# 2.20.0 to 2.21.0
+
+This document describes the upgrade instructions from `2.20.0` to `2.21.0`.
+
diff --git a/sidebars.js b/sidebars.js
index f4ea7f5..185aff8 100644
--- a/sidebars.js
+++ b/sidebars.js
@@ -421,6 +421,7 @@ const sidebars = {
     },
   ],
   upgradeGuides: [
+    'upgrade-guides/2-20-0-to-2-21-0',
     'upgrade-guides/2-19-0-to-2-20-0',
     'upgrade-guides/2-18-0-to-2-19-0',
     'upgrade-guides/2-17-0-to-2-18-0',
diff --git a/static/mgss-cover-page.html b/static/mgss-cover-page.html
index 5200066..ec325b2 100644
--- a/static/mgss-cover-page.html
+++ b/static/mgss-cover-page.html
@@ -35,7 +35,7 @@ <h2>Identification</h2>
               <td>636.101</td>
               <td>MPSA</td>
               <td>Aerie</td>
-              <td id="aerie-version">2.20.0</td>
+              <td id="aerie-version">2.21.0</td>
             </tr>
           </tbody>
         </table>