diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 821c3db..34e1a3f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,6 +27,10 @@ jobs:
           - 5.5
           - 5.4
         include:
+          - php: 8.4
+            rdbms: mysql:9
+          - php: 8.4
+            rdbms: mysql:8
           - php: 8.4
             rdbms: mariadb:10
     steps:
diff --git a/README.md b/README.md
index bddd666..1f6c008 100644
--- a/README.md
+++ b/README.md
@@ -416,6 +416,12 @@ extensions and supports running on legacy PHP 5.4 through current PHP 8+ and
 HHVM.
 It's *highly recommended to use the latest supported PHP version* for this project.
 
+This project supports connecting to a variety of MySQL database versions and
+compatible projects using the MySQL protocol. The `caching_sha2_password`
+authentication plugin (default in MySQL 8+) requires PHP 7.1+ and `ext-openssl`
+to be installed, while the older `mysql_native_password` authentication plugin
+(default in MySQL 5.7) is supported across all supported PHP versions.
+
 ## Tests
 
 To run the test suite, you first need to clone this repo and then install all
diff --git a/tests/NoResultQueryTest.php b/tests/NoResultQueryTest.php
index efccb7d..faf9271 100644
--- a/tests/NoResultQueryTest.php
+++ b/tests/NoResultQueryTest.php
@@ -76,7 +76,8 @@ public function testCreateTableAgainWillAddWarning()
 )';
 
         $connection->query($sql)->then(function (MysqlResult $command) {
-            $this->assertEquals(1, $command->warningCount);
+            // 3 warnings on MySQL 8+, 1 warning on legacy MySQL 5
+            $this->assertGreaterThanOrEqual(1, $command->warningCount);
         });
 
         $connection->quit();