diff --git a/framework/BaseYii.php b/framework/BaseYii.php
index ae8b77d..46de9cd 100644
--- a/framework/BaseYii.php
+++ b/framework/BaseYii.php
@@ -93,7 +93,7 @@ class BaseYii
      */
     public static function getVersion()
     {
-        return '2.0.39.3';
+        return '2.0.40-dev';
     }
 
     /**
diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 469ba47..5e76964 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -1,6 +1,12 @@
 Yii Framework 2 Change Log
 ==========================
 
+2.0.40 under development
+------------------------
+
+- no changes in this release.
+
+
 2.0.39.3 November 23, 2020
 --------------------------