diff --git a/wp-includes/html-api/class-wp-html-processor.php b/wp-includes/html-api/class-wp-html-processor.php
index b34b2b9baf..14cb296d43 100644
--- a/wp-includes/html-api/class-wp-html-processor.php
+++ b/wp-includes/html-api/class-wp-html-processor.php
@@ -1170,14 +1170,17 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 				}
 
 				if ( null !== $doctype->public_identifier ) {
-					$html .= " PUBLIC \"{$doctype->public_identifier}\"";
+					$quote = str_contains( $doctype->public_identifier, '"' ) ? "'" : '"';
+					$html .= " PUBLIC {$quote}{$doctype->public_identifier}{$quote}";
 				}
 				if ( null !== $doctype->system_identifier ) {
 					if ( null === $doctype->public_identifier ) {
 						$html .= ' SYSTEM';
 					}
-					$html .= " \"{$doctype->system_identifier}\"";
+					$quote = str_contains( $doctype->system_identifier, '"' ) ? "'" : '"';
+					$html .= " {$quote}{$doctype->system_identifier}{$quote}";
 				}
+
 				$html .= '>';
 				break;
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 61dfd70e2e..68a6d11107 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7.1-alpha-59404';
+$wp_version = '6.7.1-alpha-59411';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.