diff --git a/lib/Configuration.php b/lib/Configuration.php
index 3fe5b7c3..09ab539f 100644
--- a/lib/Configuration.php
+++ b/lib/Configuration.php
@@ -1,7 +1,7 @@
 <?php
 class Configuration {
 
-	public static $VERSION = "2018-06-10";
+	public static $VERSION = '2018-06-10';
 
 	public static $config = null;