diff --git a/resources/views/layouts/auth.blade.php b/resources/views/layouts/auth.blade.php
index 04fa30e4b..35922d61a 100644
--- a/resources/views/layouts/auth.blade.php
+++ b/resources/views/layouts/auth.blade.php
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
 <head>
 <meta charset="UTF-8">
diff --git a/resources/views/layouts/backend.blade.php b/resources/views/layouts/backend.blade.php
index d8af21ab6..09db1f489 100644
--- a/resources/views/layouts/backend.blade.php
+++ b/resources/views/layouts/backend.blade.php
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
 <head>
   <meta charset="utf-8">
diff --git a/resources/views/layouts/frontend.blade.php b/resources/views/layouts/frontend.blade.php
index ec00f8377..749997d7c 100644
--- a/resources/views/layouts/frontend.blade.php
+++ b/resources/views/layouts/frontend.blade.php
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
 <head>
   <meta charset="utf-8">
