app/javascript/mastodon/features/ui/components/link_footer.jsx

@@ -100,7 +100,7 @@ class LinkFooter extends PureComponent {
           {DividingCircle}
           <a href={source_url} rel='noopener noreferrer' target='_blank'><FormattedMessage id='footer.source_code' defaultMessage='View source code' /></a>
           {DividingCircle}
-          v{version}
+          <span class='version'>v{version}</span>
         </p>
       </div>
     );

app/javascript/styles/mastodon/components.scss

@@ -9008,6 +9008,10 @@ noscript {
     color: $dark-text-color;
     margin-bottom: 20px;
 
+    .version {
+      white-space: nowrap;
+    }
+
     strong {
       font-weight: 500;
     }