diff --git a/_content/doc/download.js b/_content/doc/download.js
index 06747d9..324545d 100644
--- a/_content/doc/download.js
+++ b/_content/doc/download.js
@@ -131,8 +131,8 @@
 
   // get version number.
   parseVersionNumber(string) {
-    const rx = /(\d+\.)(\d+\.)(\d+)/g;
-    const matches = rx.exec(string)
+    const rx = /(\d+\.)(\d+)(\.\d+)?/g;
+    const matches = rx.exec(string);
     if (matches?.[0]) {
       return matches[0];
     } else {