diff --git a/test/Adapter/PhpSerializeTest.php b/test/Adapter/PhpSerializeTest.php
index 2dba01d..017c26e 100644
--- a/test/Adapter/PhpSerializeTest.php
+++ b/test/Adapter/PhpSerializeTest.php
@@ -189,7 +189,7 @@ public function testWhenUnserializeClassWhiteListIsFalseButPHPIsPriorTo7AnExcept
         }
 
         self::expectException(InvalidArgumentException::class);
-        self::expectExceptionMessage('Class whitelist for unserialize() is only available on PHP 7.0 or higher.');
+        self::expectExceptionMessage('Class whitelist for unserialize() is only available on PHP versions 7.0 or higher.');
         $this->adapter->getOptions()->setUnserializeClassWhitelist(false);
     }