diff --git a/composer.json b/composer.json
index 6f91478c..cf6e5e90 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
 	},
 	"extra": {
 		"branch-alias": {
-			"dev-master": "3.1-dev"
+			"dev-master": "4.0-dev"
 		}
 	}
 }
diff --git a/src/Dibi/dibi.php b/src/Dibi/dibi.php
index cdfd8088..23a7b8c2 100644
--- a/src/Dibi/dibi.php
+++ b/src/Dibi/dibi.php
@@ -22,7 +22,7 @@ class dibi
 
 	/** version */
 	const
-		VERSION = '3.1.0',
+		VERSION = '4.0-dev',
 		REVISION = 'released on 2017-06-09';
 
 	/** sorting order */