diff --git a/src/ApiTools/constants.php b/src/ApiTools/constants.php
new file mode 100644
index 0000000..fa9ab63
--- /dev/null
+++ b/src/ApiTools/constants.php
@@ -0,0 +1,7 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ApiTools;
+
+const VERSION = '1.6.0dev';