diff --git a/ext/mysqli/tests/mysqli_character_set.phpt b/ext/mysqli/tests/mysqli_character_set.phpt
index 3398af2b2f2..8e9e943528d 100644
--- a/ext/mysqli/tests/mysqli_character_set.phpt
+++ b/ext/mysqli/tests/mysqli_character_set.phpt
@@ -45,7 +45,8 @@ if (!function_exists('mysqli_set_charset')) {
         /* The server currently 17.07.2007 can't handle data sent in ucs2 */
         /* The server currently 16.08.2010 can't handle data sent in utf16 and utf32 */
         /* The server currently 02.09.2011 can't handle data sent in utf16le */
-        if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32' || 'utf16le' == $charset['Charset']) {
+        /* As of MySQL 8.0.28, `SHOW CHARACTER SET` contains utf8mb3, but that is not yet supported by mysqlnd */
+        if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32' || 'utf16le' == $charset['Charset'] || 'utf8mb3' == $charset['Charset']) {
             continue;
         }
 
diff --git a/ext/mysqli/tests/mysqli_options.phpt b/ext/mysqli/tests/mysqli_options.phpt
index 613a19cef7f..522f60889a6 100644
--- a/ext/mysqli/tests/mysqli_options.phpt
+++ b/ext/mysqli/tests/mysqli_options.phpt
@@ -58,7 +58,8 @@ mysqli_close($link2);
 foreach ($charsets as $charset) {
     /* The server currently 17.07.2007 can't handle data sent in ucs2 */
     /* The server currently 16.08.2010 can't handle data sent in utf16 and utf32 */
-    if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32') {
+    /* As of MySQL 8.0.28, `SHOW CHARACTER SET` contains utf8mb3, but that is not yet supported by mysqlnd */
+    if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32' || $charset['Charset'] == 'utf8mb3') {
         continue;
     }
     if (true !== mysqli_options($link, MYSQLI_SET_CHARSET_NAME, $charset['Charset'])) {
diff --git a/ext/mysqli/tests/mysqli_set_charset.phpt b/ext/mysqli/tests/mysqli_set_charset.phpt
index 5ddc2f4aa89..50da0c217e3 100644
--- a/ext/mysqli/tests/mysqli_set_charset.phpt
+++ b/ext/mysqli/tests/mysqli_set_charset.phpt
@@ -82,7 +82,8 @@ if ((($res = mysqli_query($link, 'SHOW CHARACTER SET LIKE "latin1"', MYSQLI_STOR
         printf("[016] Cannot get list of character sets\n");
 
     while ($tmp = mysqli_fetch_assoc($res)) {
-        if ('ucs2' == $tmp['Charset'] || 'utf16' == $tmp['Charset'] || 'utf32' == $tmp['Charset'] || 'utf16le' == $tmp['Charset'])
+        /* As of MySQL 8.0.28, `SHOW CHARACTER SET` contains utf8mb3, but that is not yet supported by mysqlnd */
+        if ('ucs2' == $tmp['Charset'] || 'utf16' == $tmp['Charset'] || 'utf32' == $tmp['Charset'] || 'utf16le' == $tmp['Charset'] || 'utf8mb3' == $tmp['Charset'])
             continue;
 
         /* Uncomment to see where it hangs - var_dump($tmp); flush(); */