diff --git a/docs/update-check.html b/docs/update-check.html
index 1efdc4a..8b2ffa8 100644
--- a/docs/update-check.html
+++ b/docs/update-check.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />