diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 6a20156af04..600f875b4e5 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,4 +1,7 @@
 
+Drupal 7.xx, xxxx-xx-xx (development version)
+-----------------------
+
 Drupal 7.55, 2017-06-07
 -----------------------
 - Fixed incompatibility with PHP versions 7.0.19 and 7.1.5 due to duplicate
diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index d5864ff0bfc..4bc9df3c081 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -8,7 +8,7 @@
 /**
  * The current system version.
  */
-define('VERSION', '7.55');
+define('VERSION', '7.56-dev');
 
 /**
  * Core API compatibility.