diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index ca79d54a24..bf646a2a27 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -97,7 +97,7 @@ function check_comment( $author, $email, $url, $comment, $user_ip, $user_agent,
 			 * Check the comment fields for moderation keywords. If any are found,
 			 * fail the check for the given field by returning false.
 			 */
-			$pattern = "#$word#i";
+			$pattern = "#$word#iu";
 			if ( preg_match( $pattern, $author ) ) {
 				return false;
 			}
@@ -1357,7 +1357,7 @@ function wp_check_comment_disallowed_list( $author, $email, $url, $comment, $use
 		// in the spam words don't break things:
 		$word = preg_quote( $word, '#' );
 
-		$pattern = "#$word#i";
+		$pattern = "#$word#iu";
 		if ( preg_match( $pattern, $author )
 			|| preg_match( $pattern, $email )
 			|| preg_match( $pattern, $url )
diff --git a/wp-includes/version.php b/wp-includes/version.php
index fade8ddf86..8f9d8ead1f 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-alpha-54887';
+$wp_version = '6.2-alpha-54888';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.